Why are some ecosystems more productive then others?
a. some ecosystems work harder than others
b. certain ecosystems receive from humans
c. some ecosystems have more nutrients available than others

C

Explanation:

Depending on the location, climate, polluted conditions, and etc. of an ecosystem, it can vary what nutrients they have available.

a axis of a graph is a color or shade so we can all go outside and have a party so we can eat   some grilled cheese sammiches and broccoli and have some ugly fun times

i don't know why i put this, i know its not the i was just bored : p

delete this answer while you can

amber has allowed scientists to study dna that has been preserved over millions of years.