Which of these examples demonstrates homeostasis?
a.
a bird flies south for the winter and flies back north in the spring.
b.
an amoeba takes in food and digests it.
c.
a cat runs away when it hears a noise.
d.
a person's body increases blood flow to its cold feet.

Producing disposable grocery bags consumes resources. recycling disposable bags is a solution that can recover some of the resources used to make new bags. which of the following behaviors could further refine the solution? a. disposing of bags by burning them b. reusing bags whenever possible c. using bags at once so that they do not break d. using only nonrenewable materials to make new bags subject is environmental science for apex users