Check all that apply. mutations a. are random b. delete genes from the gene pool c. add new genes to the gene pool d. are changes in an organism's dna e. are rare occurrences

According to the diagram, what sources contribute to the phosphorus found in soil? according to the diagram, phosphorus found in soil contributes phosphorus to what other sources? (site 1)

Which one of these is a involving in both sexual and asexual reproduction

Tlymphocytes mature in the? a. thyroid gland. b. bone marrow. c. spleen. d. thymus.