Nitrogen-fixing bacteria are important a. they turn nitrogen from the air into nitrogen compounds in the soil. b. they are essential for plants being able to carry out photosynthesis. c. they break up dead animals in the soil. d. they release nitrogen from the soil into the atmosphere.

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.