9. Earth's crust and uppermost mantle form the O lithosphere
O asthenosphere
O hydrosphere
O atmosphere

How do you date a sample of rock that you suspect as being one of the earliest on earth

Which is an important function of normal flora? a. aid with bone marrow production. b. crowd out pathogenic bacteria. c. destroy digestive track pathogens. d. manufacture iron in the bloodstream.

What will happen if two of the base pairs of the stand of the dna are switched