Question

What must be true about the banded tetra?A. The banded tetra is a keystone species B. The banded tetra is a foundation species C. The banded tetra is in a parasitic relationship with these other populations D. The banded tetra is in a mutualistic relationship with these other populations

Answer 1

First of all, let´s analyze the graphic:

We can see that when banded tetra is present the number of population of algae, other fish or frogs increase.

That means, banded tetra is a keystone species