Which of the following describes the role that bacteria play in nitrogen fixation?
a. bacteria convert a healthy animal into a sick animal by producing a toxin or growing into a large population.
b. bacteria convert yogurt into cheese, which can be eaten as food by humans or animals.
c. bacteria convert atmospheric carbon dioxide into a form of trapped carbon that animals can use.
d. bacteria convert atmospheric nitrogen into a nitrogen-containing ion that plants can absorb.

If you answer this i"ll give you brainiest and all these points me if you do i love you 7. a doctor is at work taking care of sick patients. she spends a few minutes trying to figure out why a particular patient is sick. she taps the patient's knee to test his reflexes. while she is examining him, the patient coughs on her. a) describe the function of the skeletomuscular system in this situation. (3 points) b) describe the function of the circulatory and respiratory systems in this situation. (3 points) c) describe the function of the immune system in this situation. (3 points) d) describe the function of the nervous system in this situation. (3 points) e) describe one way that any two of the doctor's body systems worked together in this situation. (3 points)

Which best explains how this maneuver unblock a person's airway?

Out of the seven main animal groups (fish, mammals, birds, insects, reptiles, amphibians, and arachnids), how many contain members with internal backbones? a. 5 b. 3 c. 7 d. 1