Which of the following is NOT one of the four systems into which scientists divide earth A. biosphere
B. hemisphere
C. geosphere
D. hydrosphere

Why do mutations in genes affect traits? o a. genes determine what type of mutagens an organism has. o b. genes produce proteins that cause traits. o c. genes affect how many chromosomes an organism has o d. genes code for carbohydrates that influence traits.

Which beat describes the brain stem

Greenthe fossil record is the history of life recorded byhuman observationgod.climatologists.remains of the past.