If one population dies out, all the populations that depend on that species for food may also die out. A change in one population affects the entire community because all the populations of a community depend on each other.
B. O stands for Oxygen so the molecule has oxygen atoms.
Answer: The body makes sure that food does not get into the lungs because the epiglottis closes the air pathway so that food will not enter it.
Honestly this subject is really really hard .. I wish I could help sorry
There are more overweight humans than animals becuase humans can easily get food than animals. Animals are getting hunted, killed for food, so that makes it less likely for other animals to get to eat if their getting killed off.