The body's most important nonspecific defense against pathogens is/are
a. tears.
b. mucus.
c. saliva.
d. skin.

Which element is used in photosynthesis found in atmosphere and fixed by bacteria?

Drag each tile to the correct box. match the given symbol or molecular formula to the term that best describes it. element -organic compound -inorganic elemental molecule -inorganic compound -answers given: so2, k, ci2, c6h6

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.