Apyramid of numbers differs from a pyramid of energy pyramid because it

a. is organized by trophic levels, while a pyramid of energy isn't.
b. shows the amount of energy within each trophic level.
c. attempts to describe a food chain or food web.
d. displays the number of organisms at each trophic level.

What is one affect on the australian environment due to the introduction of non-native european rabbits? (a) more grass grew in response to the need of the growing population of rabbits. (b) the rabbits balance out the food chain as they became a natural prey to many predators. (c) the rabbits the land by digging, which caused the soil to spread much needed nutrients. (d) the rabbits out-competed other small animals species and caused them to go extinct.