Which problem arises when the same crop is grown year after year in the same field? A. Genetic changes to the crop become more likely.
B. More water is needed to grow the crop.
C. The crop has an increasing need for fertilizers, herbicides, and pesticides.
D. The soil becomes rockier, denser, and thinner.

Which of the following statements is true regarding a basic amino acid? a.) the hydrophilic r group of a basic amino acid will be located on the interior of a protein b.) the positively charged r group of a basic amino acid could bind dna c.) the r group of a basic amino acid would only be able to form covalent bonds with other molecules d.) a basic amino acid would be considered both polar and hydrophobic e.) all of the above