Encroach a relationship held together by a thread;

1.easily broken
2. perennial the study of the physical body and how it works
3. physiology something that continues nonstop for an indefinite period of time
4. tenuous to intrude upon or break through barriers set up by others

d is the correct answer.

b is incorrect because it makes food by itself

c is incorrect because us humans don't know how to produce their own food using the sun like plants.

a is incorrect because consumers can depend on carnivores for eating food for consumers to eat the dead organism. same thing with omnivores.

answer; obey the closest relative's wishes;

answer; occurs if the conflict is recognized logically and intellectualized;

answer; ( suicide );