Suppose x and y are the populations of two different species. Describe in words how each population changes with time. Y X At first, population x increases while y decreases. Then x and y increase together. Then x decreases while y increases. Population x always increases with time and population y always decreases.
a. Populations x and y always decrease with time proportionally to each other.
b. Population y always increases with time and population x decreases. At first, population y increases while x decreases. Then x and y decrease together. Then y decreases while x increases.