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  What causes oxygen to diffuse from the lungs into the capillaries?

  Posted by pradipshah90 on Dec 15, 2009 at 07:57 AM

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  How many organs are in the human body?

  Posted by dvedwards on Dec 14, 2009 at 07:47 AM

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  How the adaptations of  herbivore behavior fight against plant defensive system?

  Posted by fryvonne on Dec 14, 2009 at 06:12 AM

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  Explain how carotene works as a defense weapon for a plant?

  Posted by kikiri on Dec 14, 2009 at 05:17 AM

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  What are the structural features for each of the following cell parts?

  Posted by catlover on Dec 12, 2009 at 07:17 PM

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  What are the exact locations for each of the following cell parts?

  Posted by animallover on Dec 12, 2009 at 07:08 PM

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  What causes adrenal virilism?- overgrowth of adrenal cortex or hypersecretion from adrenal cortex?

  Posted by itssnigdha on Dec 11, 2009 at 02:42 AM

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  "A plant attacked by insects uses different ways of defense". Give examples to support the claim.

  Posted by kikiri on Dec 11, 2009 at 12:31 AM

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  Polar Bears are more an more affected by mercury pollution. How is this happening?

  Posted by rhaea on Dec 10, 2009 at 01:43 AM

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  Has the plant color an important role in attracting the insects?

  Posted by pufsipene on Dec 10, 2009 at 01:21 AM

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  How a bug can  scour on Acacia species not being attacked by guardian ants?

  Posted by flowerelia on Dec 10, 2009 at 01:08 AM

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  what is a analogy for cytoskeleton

  Posted by tomybob on Dec 9, 2009 at 08:14 PM

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  What is the most common component of urine?

  Posted by sandali on Dec 7, 2009 at 10:01 PM

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  Explain why mitosis could not provide for the sexual reproduction of offspring that contain the same number of chromosomes as the parents.

  Posted by shawtymac on Dec 6, 2009 at 05:22 PM

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  Describe the amoeba.

  Posted by sandali on Dec 5, 2009 at 10:22 PM

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  What is adaptive radiation?

  Posted by wkwolf16 on Dec 3, 2009 at 07:53 PM

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  Which do you think has a higher caloric value per serving, fats or carbohydrates (sugars and starch)?

  Posted by mandabearbaybe on Dec 2, 2009 at 05:37 PM

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  What is the biggest animal in the world?

  Posted by monax on Nov 28, 2009 at 08:38 AM

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  What are leading and lagging strands during DNA replication?

  Posted by sandydd on Nov 27, 2009 at 12:05 PM

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  What is the equation for photosynthesis?

  Posted by colby012 on Nov 16, 2009 at 03:29 PM

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  Is there a difference in the structure of hair in a dog's winter coat vs. his summer coat?  Explain.

  Posted by atropiano on Nov 12, 2009 at 04:01 PM

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  What year was the cytoplasm dicovered and also who discovered it? 

  Posted by koko2012 on Nov 12, 2009 at 06:21 AM

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  Describe the suspected effects of hormones being added to our foods. Is there a link between early puberty and the added hormones?

  Posted by xtreme69 on Nov 8, 2009 at 04:43 PM

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  I'm interested in any information regarding tomatoes' mycosis

  Posted by istetz on Nov 6, 2009 at 04:29 AM

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  How many bones does an eight year old have?

  Posted by griffaj on Nov 3, 2009 at 03:05 PM

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  Write short notes on i) Heat production and regulation in human body, ii) Paced and unpaced work, iii) Human work efficiency and work load.

  Posted by anil007 on Nov 3, 2009 at 03:31 AM

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  What is metabolism? How much energy is available for a person to perform any physical work? How body utilizes rest of the energy?

  Posted by sachin12345 on Nov 3, 2009 at 03:16 AM

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  Why can water run uphill throughout a tree?

  Posted by batty0814 on Nov 1, 2009 at 03:24 PM

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  How many hair follicles does a human have?  

  Posted by dwmcree on Oct 29, 2009 at 05:02 PM

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  Why is there loss of pigments & leaves during certain seasons of the year and how does this relate to the rate of photosynthesis?

  Posted by davidfung on Oct 27, 2009 at 07:52 PM

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  How is the energy trapped by a plant, stored and then released several days later?

  Posted by wahajsaleem on Oct 25, 2009 at 11:14 AM

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  mother with b+ blood group and father with o+ can produce baby with o- blood group?

  Posted by aulakhsimran on Oct 25, 2009 at 06:12 AM

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  What is taxonomy all about?

  Posted by wantosh on Oct 23, 2009 at 06:41 PM

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  Why is animal testing important?

  Posted by niasole22 on Oct 21, 2009 at 08:41 AM

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  What are the Endocrine glands and what are their purpose?

  Posted by valenjenkins on Oct 21, 2009 at 04:12 AM

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  What is blood made up of?

  Posted by hbzuk on Oct 21, 2009 at 02:42 AM

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  What happens in the pulmonary circulatory system?

  Posted by parle on Oct 21, 2009 at 01:44 AM

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  Describe the functions of Plasma Membrane.

  Posted by victor1982 on Oct 21, 2009 at 01:36 AM

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  What is the significance of legumes, nodules, and the bacteria within the nitrogen cycle?

  Posted by lol1234 on Oct 20, 2009 at 08:27 PM

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  Could the following statements about theoretical growth curves for predators and prey actually represent what happens in nature?

  Posted by dogcrazy on Oct 20, 2009 at 07:36 PM

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  What would happen to the exponential growth curve of a population if a pollutant or a new predator were introduced into an environement?

  Posted by catlover on Oct 20, 2009 at 07:24 PM

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  According to the anatomical position, why is the dorsal surface of the foot considered posterior when it is located on the TOP of the foot?

  Posted by debbiebuf on Oct 18, 2009 at 07:43 AM

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  Do photosystem I contain only chlorophyll b?

  Posted by sandra112 on Oct 17, 2009 at 05:53 PM

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  What are the consequences if the testes failed to descend from the abdominal cavity during embryo development?

  Posted by ss-drty on Oct 16, 2009 at 06:36 AM

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  Explain the process of glycolysis.

  Posted by sandydd on Oct 8, 2009 at 07:03 PM

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  how do materials enter and leave the nucleus?

  Posted by melinda2009 on Oct 8, 2009 at 04:18 PM

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  The ultimate chemical nature of protoplasm cannot be determined. Explian briefly.

  Posted by hillywilly on Sep 19, 2009 at 09:29 AM

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  why do some organelles have their own DNA?

  Posted by anks28 on Sep 17, 2009 at 09:29 PM

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  Why do cells need a selectively permeable barrier?

  Posted by derica on Sep 14, 2009 at 02:37 PM

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  What is the difference between archaebacteria and eubacteria?

  Posted by kelvin1218 on Sep 1, 2009 at 05:30 PM