Which of the following is a correct statement about an organism and its environment?
a. the gastrovascular cavity provides the nutrient exchange surface in mammals.
b. an animal is a closed system that is separate and distinct from its environment.
c. interstitial fluid is the go-between for body cells and the circulatory system.
d. animals are able to live as long as they remain isolated from their environments. e. none of the choices is correct.

hey there!

so, when you eat, your teeth chew and grind food into smaller pieces. this is mechanical digestion. then reactions aided by digestive enzymes break down large food molecules into smaller molecules. this is chemical digestion. the two processes change the food into simpler substances that can be used by the body for raw materials and energy.

hope this

tobey

burning of wood and coal

explanation:

the panel also concluded there's a better than 95 percent probability that human-produced greenhouse gases such as carbon dioxide, methane and nitrous oxide have caused much of the observed increase in earth's temperatures over the past 50 years.