According to the critical period hypothesis, children will never learn to use language normally unless they are exposed to language by

age 1 or 2 years : )

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.

using the scientific method.