According to thorsten sellin, the purpose of is to define what is considered appropriate or normal behavior and what is inappropriate or abnormal behavior.

The correct word to fill in the blank will be "norms"

Explanation:

According to Thorsten Sellin, the norms are the rules that reflect the attitude of each group where we belong, also used to define what is considered appropriate, normal or abnormal behavior in our society.

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.

the answer is a wheel