Which is an example of a parasite/host relationship in a
freshwater ecosystem?
A. a bank swallow whunts a mayfly
B. a grizzly bear finds shelter in a cave
C. giardia live in a deer's intestnes
D. an insect eats algae

pls help!!!

How does a gymnosperm prevent itself from pollinating the same tree

Pls in your opinion, what are the limiting factors that might affect the growth or diversity of our ecosystem? respond to this question in claim, evidence, reasoning format. 1. make your claim (i are the limiting factors that might affect the growth or diversity of our 2. follow the claim with 3 pieces of evidence. evidence may be taken from the reading, the videos, previous lessons, or googled answers. site sources, too. 3. use reasoning to explain why you chose your evidence.

Everything in the universe originated from a single point. how was it possible for everything in the universe to have occupied a single point in space?