Answer:
i think d but not too sure.
Explanation:
I think it is either d or b but pretty sure d
Then answer is b. Cnidaria
Earth's history. In the worst one, 250 million years ago, 96 percent of marine species and 70 percent of land species died off. It took millions of years to recover.
Electricity is caused by moving particles that have either a negative or postivite charge
