Which animal has modified ecosystems more than any other animal and has had the greatest negative impact on world ecosystems? gypsy moth
zebra mussel
human
shark

Plz will mark! the diagram shows the positions of the sun, moon and earth during spring tides, when the high tides are at their highest and low tides at their lowest. what is it about these positions that causes these high and low tides?

Did you know that a single bee would have to go to over 2 million flowers to make a single pound of honey?

The united states uses which source of energy to produce almost 40 percent of its electricity