Antonella is on vacation with some friends in montana. one day, she is out hiking in the woods when she hears a sound in the distance. she turns around and sees a grizzly bear coming out of the bushes. she freezes and becomes fearful of what the bear will do. which system prepares the body for the situation described in the scenario? answers: the somatic nervous system the parasympathetic nervous system the central nervous system the sympathetic nervous system

D- the sympathetic nervous system

Explanation:

step 1 ammonium can be absorbed by plants, but some is converted into nitrates which are better for plants to absorb. this is called nitrification. 2. step 2 the deer eats the plants and uses the nitrogen-containing proteins for cell growth. 3. step 3 bacteria in the soil conduct nitrogen fixation to convert nitrogen gas from the atmosphere into ammonium. 4. step 4 some of the nitrates are absorbed back into plants, but denitrification breaks down the nitrates into nitrogen gas released back into the atmosphere. 5. step 5 nitrogen is found in the urine, which gets broken down into ammonium through the process of ammonification. 6. step 6 plants absorb the ammonium and begin assimilation, the process to add the nitrogen to protein.

the sugar-phosphate backbone forms the structural framework of nucleic acids, including dna and rna. this backbone is composed of alternating sugar and phosphate groups, and defines directionality of the molecule.