Pls , im in the test right now
when the blood oxygen level drops due to excercise; what happens after the change has been detected?

a. you shiver.

b. you breathe more rapidly and heavily, and your heart rate increases.

c. skin produces sweat.

d. the friction caused by the muscles shivering warms the body.

Which incident would result in primary succession instead of secondary succession?

Select the correct answer. which scenario describes unethical lab behavior? o a. danny stores the chemicals required for his experiment in flasks and beakers. b.anna publishes the results of her experiment on the growth rate of saplings. c.jason repeatedly runs an experiment until he gets the results he desires. d. mia records her observations of an experiment precisely and accurately.

Amino acids contain the elements carbon, hydrogen, oxygen, nitrogen, and sometimes sulfur. of the 20 amino acids found in humans, 11 are called "nonessential" because they can be manufactured by the body when needed. which elements in these 11 amino acids are commonly obtained from the metabolism of sugar molecules?