Dr. Soult is studying the use of undifferentiated embryonic stem cells in the fight to cure leukemia. Which is a practical and ethical
source for these building block cells?

Ascientist separates a population of mice into two groups. what would most likely increase the rate of speciation in this population. a. teach the two groups different tricks b. allow the two groups to breed with each other c. put the two groups in different environment d. have the two groups live in identical ecosystems

Variety of living organisms; includes genetic, species, and ecological types.

What is a photon? a. part of a ribosome b. a light particle c. a carbon dioxide molecule d. part of a chloroplast b.a light particle