Ascientist observes two cells. cell 1 and cell 2 both contain dna (genetic material) and ribosomes. however, cell 1 contains a nucleus and other membrane-bound organelles, which cell 2 does not.

Heat from earths interior and pressure from overlying rock transform the remains of marine sediments into

Legumes, a type of plant, require rhizobia, a type of soil bacteria, to survive since these organisms fix nitrogen during photosynthesis. rhizobia use the legumes for food. what would most likely happen to the legume population if rhizobia suddenly became extinct?

In a lab, scientists grew several generations of offspring of a plant using the method shown. what conclusion can you make about the offspring? a. they formed from meiosis and mitosis. b. they have half the number of chromosomes as their parent. c. they have low genetic variability among them. d. they will be able to reproduce only after they grow flowers.