Http://www.pbs.org/wgbh/nova/cancer/folkman.html
I believe this website will help :)
The answer is A - stores genetic information I think
The main structural difference between LDL and HDL is their compositions. Approximately 50% of the weight of an LDL particle is cholesterol and only 25% is protein. High-density lipoprotein particles, on the other hand, consist of 20% percent cholesterol by weight and 50% protein.
Well, different organisms require different things. A single celled bacteria does not need a lot at all compared to a plant or animal. One cell can support a bacrerium. An animal needs many cells to carry out the functions necessary for it to live.
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A frog is an amphibian so it survive both on land and water
Hope this helps:)