A study was completed to determine the effect of the banded tetra on other plant and animal populations in its tropical stream environment. The scientists looked at the population level of other species before and after they removed banded tetras. 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.

What is thought to have caused the mass extinction at the end of the cretaceous period?

Which term describes a normal value for something in the body? a.homeostasis b.set point c.feedback loop d.integration center

In the united states there are strict fishing seasons and limits, but not all countries enforce similar laws. in bangladesh there are few if any fishing restrictions. what might be the reason for less restrictions in smaller countries like bangladesh? a) the united states is the only country worried about overfishing. b) the united states wants to limit the supply of fish to increase the price. c) bangladesh and smaller countries have an unlimited supply of fish in their coastal waters. d) small countries, such as bangladesh, are practicing subsistence fishing, taking only the fish needed to survive.