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  • Science
    Generally the equation used to calculate ALT activity (especially if you look at a few equipment manuals) is the following, which makes sense when you consider the units and how a unit of activity...

    Asked by user8085355 on via web

    1 educator answer

  • Science
    The terms "parallel" and "series" refer to the two different ways in which the elements of an electrical circuit can be connected. The elements of the circuit could be light bulbs or household...

    Asked by user7488708 on via iOS

    1 educator answer

  • Science
    Although there could be a number of factors for the same, the most significant one is the ban on DDT. DDT was a very commonly used insecticide in the agricultural fields around the world. However,...

    Asked by meakhamanuel on via iOS

    1 educator answer

  • Science
    The solar system model of an atom, usually called the "planetary" model, describes an atom as composed of a single positively charged nucleus and several electrons. The electrons orbit around the...

    Asked by user9645397 on via web

    1 educator answer

  • Science
    Friction occurs when two objects come into contact with one another. Friction is a force that works in the opposing direction than an object is moving. The smoother the surfaces of the two objects...

    Asked by enotes on via web

    1 educator answer

  • Science
    Resonance is a phenomenon of maximizing the amplitude of a periodic motion, oscillation, or vibration. The best way to understand how it occurs is by considering a swing. If you are sitting on a...

    Asked by enotes on via web

    1 educator answer

  • Science
    Chemical changes are those changes where chemical reactions take place and changes in chemical composition occur. This may include the breakdown of complex chemicals into simpler chemicals or the...

    Asked by gabbymartinez2015 on via iOS

    1 educator answer

  • Science
    I'm not sure if this question is asking about how the first humans were made/appeared on Earth, or how a new human is produced. I'll answer the second option because the science is more concrete....

    Asked by enotes on via web

    1 educator answer

  • Science
    Neutrons do not have any charge on them and hence are neutrally charged. In comparison, protons are positively charged and electrons are negatively charged. Neutrons are present in the nucleus of...

    Asked by enotes on via web

    1 educator answer

  • Science
    Earthquakes happen as a result of the movement of Earth's tectonic plates. Earth's outer most layer is the lithosphere. It is composed of all of the crust and the upper, more rigid layer of the...

    Asked by enotes on via web

    1 educator answer

  • Science
    The first video is based on experiments done by the Algalita research group on the North Pacific Gyre, to study the quantity of trash in this part of the ocean. Study results indicate that for...

    Asked by hayatyassin82 on via web

    1 educator answer

  • Science
    Everything that we see around us -- plants, water, animals, metals, etc. -- is all matter; that is, they occupy space and have mass. The matter is composed of molecules and these molecules are held...

    Asked by enotes on via web

    1 educator answer

  • Science
    In simplest terms, the metabolic energy, or the energy produced through the process of metabolism, is used in swimming. This energy is converted into the mechanical energy that the swimmer needs to...

    Asked by enotes on via web

    1 educator answer

  • Science
    This is a good question. Speed and velocity are not the same thing; however, most people incorrectly use the two terms interchangeably. Speed is a scalar quantity. That means it can be described...

    Asked by enotes on via web

    1 educator answer

  • Science
    I am going to assume that this question is referring to human anatomy. Sperm are the male sex cells (gametes). They carry exactly half of the genetic code. In humans, this means that each sperm...

    Asked by enotes on via web

    1 educator answer

  • Science
    The universe is made up of the following three components: 1) Matter (or baryonic matter): 4.6% 2) Dark Matter: 24% 3) Dark Energy: 71.4% The baryonic matter is the matter that we are familiar...

    Asked by aronmatpady on via web

    1 educator answer

  • Science
    It is really difficult to summarize the achievements and life of a person as brilliant and as versatile as Leonardo da Vinci. I am highlighting few key aspects of his life and work. Hopefully, this...

    Asked by enotes on via web

  • Science
    Hello! Thank you for your question! I do have to say, it is worded somewhat vaguely. Hopefully I can give you an answer that helps. If you meant to ask "What started the Big Bang," then well, it...

    Asked by enotes on via web

    1 educator answer

  • Science
    DNA is bigger than RNA. DNA stands for Deoxyribonucleic Acid, and RNA stands for Ribonucleic Acid. DNA is a double-strand helix with a long chain of nucleotides, whereas RNA is only a single-strand...

    Asked by enotes on via web

    1 educator answer

  • Science
    Ammonium chloride, sodium chloride, and sand can be separated from each other by using the following steps: 1) Sublimation for separation of ammonium chloride: Ammonium chloride undergoes...

    Asked by enotes on via web

    1 educator answer

  • Science
    Robert Koch made a number of significant contributions to bacteriology and is commonly termed the father of modern bacteriology. Some of his contributions are: 1) Koch's postulates: A set of four...

    Asked by enotes on via web

    1 educator answer

  • Science
    A barn owl typically preys on small mammals such as field voles, common shrews, wood mice, etc. The barn owl is highly adapted to hunt these mammals and is a very effective predator. The barn owl...

    Asked by enotes on via web

    1 educator answer

  • Science
    The simple reason is gravity. Gravity is, in simple terms, the force with which one object attracts another object. Heavier objects exert a much larger gravitational pull on lighter objects as...

    Asked by enotes on via web

    1 educator answer

  • Science
    This statement is probably false, but the question is a little ambiguous. If the statement intends "identical" to mean that the earthquakes are literally identical in all respects, then the...

    Asked by user1325504 on via web

    1 educator answer

  • Science
    Rivers bring the dissolved minerals to the ocean. Over the course of their flow (over land), river water dissolves the minerals from the strata of the channel. Rivers also receive the water from a...

    Asked by deqa116 on via iOS

    1 educator answer

  • Science
    Actually, polar bears are Arctic animals, not Antarctic. The largest carnivores on the Antarctic continent are seals and penguins. These animals feed on fish and are quite approachable since there...

    Asked by enotes on via web

    1 educator answer

  • Science
    It is a good idea to regulate the trade in minerals originating from the strife-torn Democratic Republic of the Congo. As with Sierra Leone and other countries and regions wars in which were...

    Asked by hayatyassin82 on via web

    1 educator answer

  • Science
    Roller Coasters make use of the three laws of motion given by Newton. Newton's first law of motion states that a body at rest will continue to be at rest and a body in motion will stay in motion,...

    Asked by enotes on via web

    2 educator answers

  • Science
    The scientific study of hair is known as Trichology. It is a branch of dermatology (the study of skin). In fact, trichology is not only the scientific study of hair but is also the scientific study...

    Asked by enotes on via web

    1 educator answer

  • Science
    There are a number of differences between the processes of photosynthesis and respiration. Photosynthesis takes place in green plants, cyanobacteria, and algae. In this process, carbon dioxide and...

    Asked by enotes on via web

    1 educator answer

  • Science
    Conservation of energy is one of the basic principles of physics. It has several different statements, which are all equivalent. Here's the definition of the law of conservation of energy from...

    Asked by enotes on via web

    1 educator answer

  • Science
    Strictly speaking, bones aren't white—not gleaming white, at any rate. Living bones inside the body contain a number of pigmented chemicals. They are essential for the body's health and give our...

    Asked by enotes on via web

    1 educator answer

  • Science
    pH measures how acidic/basic water is at any given time. This scale ranges from zero having the most acidity, to fourteen having the most alkalinity. The neutral pH is right in the middle (7) and...

    Asked by enotes on via web

    1 educator answer

  • Science
    There are lots of different kinds of cells that exist; therefore, describing a single method by which every cell makes ATP is not possible. I believe that the question is likely asking about human...

    Asked by enotes on via web

    1 educator answer

  • Science
    To understand this, we must first provide definitions for "disaster" and "hazard" in order to differentiate between the two. According to Merriam-Webster, there are a few definitions each for...

    Asked by enotes on via web

    1 educator answer

  • Science
    Photosynthesis is the process through which chlorophyll-containing plants consume carbon dioxide and produce oxygen and food (in the form of sugars). This process takes place in the presence of...

    Asked by user28267 on via web

    1 educator answer

  • Science
    An element is only made out of one particular atom. If you were to look at the periodic table, every square is representing one element. So, sodium (Na) is just sodium. It is made up of only sodium...

    Asked by cjkuklok on via web

    1 educator answer

  • Science
    When you take a sample of something—a dirt sample from an archaeological site, a sap sample from a tree, an ice sample from the Arctic—you are taking a statistical sample of the substance's...

    Asked by cjkuklok on via web

    1 educator answer

  • Science
    I believe that this question is asking whether or not table sugar is a mixture. Table sugar, or sucrose, is not a mixture. It is a compound. Let me start with a pure substance and work up from...

    Asked by hannah4165 on via iOS

    1 educator answer

  • Science
    DNA has four nitrogen bases. They are abbreviated A, T, C, and G. A and T can pair up, and C and G pair up. This is why they are referred to as base pairs. Human DNA has approximately 3 billion...

    Asked by user9107161 on via web

    1 educator answer

  • Science
    Composition Water is composed of two hydrogen atoms and one oxygen atom and is expressed as H20. When hydrogen and oxygen bond in this combination, a single molecule of water is created. The...

    Asked by peace619 on via web

    1 educator answer

  • Science
    If you check the internet for pulmonary vasoconstriction, every hit names the condition as hypoxic pulmonary vasoconstriction. That should clue you in to its major cause: hypoxia, or a lack of...

    Asked by lkdavis2009 on via web

    1 educator answer

  • Science
    I'm unsure whether "how have their systems evolved" is asking for a likely method of evolution or is asking about what specific things an organism does to maintain homeostasis and equilibrium. If...

    Asked by lovemy2littleladies on via web

    1 educator answer

  • Science
    Ozone depletion and climate change are two distinct processes whose relationship is still marked by uncertainty. However, certain facts about the two processes have been established. For instance,...

    Asked by jasonwise13 on via web

    1 educator answer

  • Science
    In 2006, the International Astronomical Union (IAU) declared that Pluto was no longer considered a planet but, instead, a dwarf planet. After Pluto was discovered in 1930, debate continued about...

    Asked by picklerick on via web

    1 educator answer

  • Science
    First, let us find the runner's velocity in miles per hour. The velocity v can be found as the distance by the time during which the distance was traveled: `v = 23.5/2 = 11.75` miles per hour...

    Asked by hanahawari on via iOS

    2 educator answers

  • Science
    The best way to answer this question is to list out the characteristics of living things and then decide which of those characteristics an automobile doesn't have. The six characteristics of...

    Asked by aaliyah1876 on via iOS

    1 educator answer

  • Science
    Unicellular and multicellular organisms are similar in many ways, but the main difference comes in the form of their cellular makeup. Unicellular organisms are made up of only one cell (the prefix...

    Asked by rahiypatel on via iOS

    1 educator answer

  • Science
    Depending upon the type of desert, there are myriad forms of life, from microscopic organisms to 60-foot-tall saguaro cacti. Deserts can look very different from one another. In the deserts of the...

    Asked by morganisaboss123 on via iOS

    1 educator answer

  • Science
    Atoms are the basic building blocks of matter. They are composed of positively charged particles (protons) and negatively charged particles (electrons). Many also have neutrally charged particles...

    Asked by enotes on via web

    1 educator answer

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