All sells need water to survive in order to how do you maintain the necessary amounts water blows across the cell membrane from areas of higher concentration to areas of lower concentration what is the flow of water called

One group of reptiles, characterized by the fossil ark metal x

Which best describes the digestive system of arthropods? a incomplete, two openings b complete, one opening c two-way, one opening d one-way, two openings

Why are fossils not found in igneous rocks? igneous rocks are made from cooling of lava or magma. igneous rocks are found too deep underground. igneous rocks are too dark in color to contain fossils. igneous rocks are too dense to contain fossils.