How will varying the stream gradient change the
water velocity? What effect will the gradient have
on the river shape over time?

Explain how the political influence of african americans leaders became weaker.

This is the interaction of two organisms where one is and the other is neither nor harmed.

Ascientist wanted to formulate a pill to attack a specific type of bacteria that infects the throat. which biological component would be best to use as a model for the pill's function? bacteriocytes phagocytes complement antibodies