Which of the following practices can control erosion?

recycling paper
harvesting earlier
tree removal
contour plowing

Which of the following occurs after a natural or unnatural disturbance in an ecosystem

As a small change in a person's dna can cause a genetic disorder

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?