Charles darwin hypothesized that bipedalism arose so that hominins would have two free hands to create and carry weapons. what does fossil evidence that now refutes this hypothesis include?

How can antibodies "remember" a particular bacterial invader or "antigen" on that invader?

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.

Where is most of the fresh water on earth found a in the ocean b in glaciers and in ice caps c in rivers d in the soil