What are reference books used for and why should they be written down?

refrence book is a book intended to be consulted for information on specific matters rather than read from beginning to end

it's important, so then you won't be plagerizing

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.

because he had a big bear belly