Why are desert soils low in organic matter

a. there are not enough plants

b. the temperatures are too high

c. there are to many grazing animals

d. there are not enough minerals

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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.

The first amino acid of a new polypeptide chain is