# Science

• Science
Biomass is an ecological term that refers to the total mass of all organic matter that exists within an ecosystem. That total mass can be divided up in a variety of ways. For example, a biologist...

• Science
There isn't a definitely correct or incorrect answer to this question. You may certainly disagree with this statement and provide an explanation as to why you feel that way. Perhaps you support the...

• Science
The heart is a complex organ made up of several layers of tissue and other key components that are vital to its operation. First, the heart wall is comprised of three layers of tissue, each with a...

• Science
As the question indicates, an atrial septal defect is commonly called a "hole in the heart." Conveniently, the medical name of the defect tells people where the defect is. The septum is the wall...

• Science
This question involves a lot of different, but related, topics. It deals with the concept of interdependency, the flow of energy through ecosystems, food chains, food webs, predator and prey...

• Science
Black rhinos are one of two African rhino species, and they are the smaller of the two species. Their population numbers have drastically declined since the beginning of the twentieth century....

• Science
The Arctic tundra, the farthest north and coldest of the biomes, is located at and near the Arctic Circle. The climate is extremely cold and arid, with desert-like conditions that receive very...

• Science
Affluence can contribute to environmental degradation when affluent consumers consume too many nonrenewable resources. Affluent consumers have the means to consume whatever they wish; therefore,...

• Science
There are multiple reasons why shark populations are in decline. Climate change and over fishing (of sharks and shark prey) are two common reasons for why shark population numbers might be...

• Science
While I can't draw you a diagram for this answer, I can provide a link to an online image that highlights some of the basic unique qualities to arteries, veins, and capillaries. I can also...

• Science
Dinitrophenol or DNP or 2,4-dinitrophenol (IUPAC name) is a chemical compound with a chemical formula of C6H4N2O5 and a molecular weight of 184 g/mol. This is an organic compound with a benzene...

• Science
Limiting factors and tolerance are related to each other, and both deal with ecosystems and biotic and abiotic factors that are present within any given ecosystem. Biotic factors are living factors...

• Science
The ideal pesticide should only kill the intended pest as most insects are beneficial to the environment and serve as either predatory species or pollinators. Killing beneficial insects could lead...

• Science
Global climate change affects the future of everyone in the world. One uncomfortable truth is that wealthy countries with higher carbon emissions have contributed far more to the problem than...

• Science
Differences: - DNA is double-stranded, RNA is single-stranded. - DNA contains a pentose sugar Deoxyribose, RNA contains the pentose sugar Ribose. A pentose is a 5-carbon sugar molecule. - DNA is...

• Science
This is a great question and I can see your confusion. There are similarities, but there are also differences. I will give you a definition of each and then provide an example. Speed refers to how...

• Science
A rainbow is made by the reflection and refraction of light that interacts with raindrops. Depending on how this interaction occurs with your location relative to the sun and the raindrops you may...

• Science
The key heart tissue is cardiac muscle tissue. Cardiac muscle tissue is a specialized type of muscle that only forms in the heart. It is muscle tissue that contracts and relaxes involuntarily. The...

• Science
Pyrethroids and pyrethrins are both insecticides that are a part of more than 3,500 different products. Those products are widely used in households, on pets, in clothing, and in agriculture. They...

• Science
There are several questions being asked here, but I should be able to weave them together in an answer. DDT is an insecticide that was first synthesized in 1874 by a chemist named Zeidler. Prior to...

• Science
Research on operant conditioning has found that behavior is most affected by unconditioned positive reinforcers (stimulus which is innately rewarding, such as food) without delay in delivery....

• Science
An inability to lower heart rate following an increase in pulse would likely be related to injury to the medulla oblongata, which connects the spinal cord to the brain and is responsible for...

• Science
The objects typically referred to as "failed stars" are brown dwarfs, which are larger than planets but smaller than stars. Brown dwarfs have much greater density than Jupiter but are often only...

• Science
One of the oldest questions human beings have asked relates to the presence of life elsewhere. Many people want to know if life exists somewhere other than the planet Earth. Theories and stories...

• Science
Richard Axel was born in Brooklyn on July 2, 1946. The majority of his working career was focused on molecular biology. His career as a professor started in 1978 at Columbia University in the...

• Science
If true or false are the only possible answers, then answer false. The question itself is oddly worded. Hypertonic and hypotonic are words that are used to describe solution types, and the terms...

• Science
When viewed under a microscope, skeletal muscle fibers do indeed appear to be striated. This is because each muscle cell contains multiple repeating parallel bundles of the proteins actin and...

• Science
This is, unfortunately, a recurring scenario in the justice system. Far too often, in the not-so-distant past, individuals were convicted on merely circumstantial evidence—or worse, false...

• Science
This use of scientific discoveries in the past couple of decades is truly helping people all over the country who were wrongly convicted decades ago. Check out the link below for one such case. In...

• Science
Tubocurarine (tubocurarine chloride, d-tubocurarine or DTC) is actually a very toxic and dangerous drug, which was originally used as arrow poison. Later on, doctors used it as an anesthetic during...

• Science
The part of the brain that these chemicals would most likely be affecting is the hypothalamus. Mammalian thermoregulation is controlled by the hypothalamus in the brain. Because mammals must...

• Science
The key fact in the article that surprised me most was that relating to so-called microplastics. Although world production of plastics has increased exponentially over the decades—reaching almost...

• Science
The answer to your question comes from Newton's Second Law of Motion. Newton's Second Law, in simple terms, states, When a force acts on an object, the object accelerates in the direction of the...

• Science
I am going to assume that this question is asking about Newtonian physics and forces rather than asking about atoms and what forces are happening within the very fabric of the rock itself. Let's...

• Science
Throughout life, a person's ability to recognize, regulate, and express their feelings changes. This is what emotional development refers to. This development is particularly important and notable...

• Science
You are only allowed to ask one question at a time so I edited down accordingly. First we must balance the chemical equation you have given for the combustion of methane: CH4 + O2 --> CO2 + H2O...

• Science
The initial velocity is u = 20 m/s We can use the following equations of motion to solve this question: v = u + at s = ut + 1/2 at^2 v^2 = u^2 + 2as Here, 'u' is the initial velocity, 'v' is the...

• Science
Sodium chloride (NaCl) and silver nitrate (AgNO3) are both solids that are highly soluble in water. They give a double displacement reaction where the ions switch places and give sodium nitrate...

• Science
When magnesium reacts with hydrochloric acid, hydrogen gas and soluble magnesium chloride are produced according to the following equation: Mg_((s)) + 2 HCl_((aq)) -> MgCl_2_(aq) + H_2_(g) The...

• Science
Environments in which you can find water are called aquatic environments. There are two main categories of aquatic environments- marine (oceans and seas) and freshwater (rivers, streams, ponds,...

• Science
The brain is composed of three primary parts: the forebrain, or cerebrum, the midbrain, and the hindbrain. Each of these are made of smaller parts, and each part of the brain has a specific...

• Science
An ecosystem is a specific section or region within the biosphere. The biosphere is all of the area on Earth that can sustain life. Within the biosphere, there are ecosystems that contain all of...

• Science
Several analogies are commonly applied to describe receptors; for example, radio antennas or the lock in a door. Receptors "receive" information, but not just any information; they are specifically...

• Science
First, we should recognize that the formula (H2SO4) is not hydrochloric acid. The root "chlor" in "hydochloric acid" denotes the presence of chlorine, which is not present in H2SO4. Hydrochloric...

• Science
Osmosis is diffusion of water across a semi-permeable membrane. Salt is too big to pass through a cell membrane, but water molecules can fit. Since everything wants to reach equilibrium, the only...

• Science
We can argue that science is both a boon and a curse for humankind. I will make both arguments and you can decide which you find more compelling. You can argue that science is a boon for...

• Science
Body tissues that consist of cells with adjacent plasma membranes are usually those in which a high degree of fast communication is required to facilitate tissue function. There are various types...

• Science
This article is very short, and there is not much to summarize. The article can essentially be broken down into 2 parts. The first part lets the reader know what signs and symptoms to look out for...