Organisms that rely on other living things for food are called: a. multicellular b. vertebrates c. eukaryotes d. heterotrophs

Heterotrophs

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Answer : The correct answer is-

D. heterotrophs.

Heterotrophs are those organisms that can not synthesise their own food (unlike plants and algae) and are dependent on other organisms ( either plants or animals) for their nutritional requirements.

Example- Rabbit, deer, horse, human beings.

Thus, option D) is the right answer.

answer: populations of walruses and polar bears will decline

explanation:

you put it

"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."