Hox genes: a. control the development of language in humans. b. control which amino acids get plugged into polypeptide chains. c. appear to function in similar ways across diverse groups of organisms. d. function only in fruit flies.

the answer is a or when it says crossing over

it's c.us forest service

the rocks are classified by the geological process they are formed by. the three main groups of rocks are igneous, metamorphic, and sedimentary. minerals are not they are classified under the chemical classes they are in. these groups include silicates, sulfates and carbonates.