Aquatic biomes are characterized by their location their depth amount of rainfall amount of dissolved oxygen

Option A

Explanation:

Aquatic Biome is a natural habitat which is characterized on the basis of physical and chemical characteristics of the habitat, its climatic condition, location and form of life existing in it. There are several types of aquatic biome –

a)Freshwater biome – Water that occurs on the surface of earth and has low concentration of salt and other solids

b)Freshwater wetlands – It’s a land saturated with water generally formed by overflowing of water over any land

c)Marine Biome – Deep ocean and seas

d)Coral reef Biome  

e)Estuarine Biome

Hence, option A is correct

"1. it should be, it has been for about 20 years, and it's really not much different in the end than breeding animals to have particular traits. there are always concerns about genetically engineered animals/plants affecting the environment in unexpected negative ways, but i can't think of an example where the fears didn't turn out to be baseless.  

first, as you point out, it would be a great advance in pharmacology, to be able to tailor drugs and their doses to me. the pros involve better medical treatment. the cons involve privacy issues like insurance companies denying coverage to people with genetic risk factors. looking at dna markers wouldn't affect the frequency of genetic diseases, but it would allow detection of them earlier. and ok, actually i suppose that if people used this information to avoid having children with genetic diseases, some might decrease in frequency."

because they are eaten by the frog and the frog getseaten by the snake and the snake by the eagle