The scientific term for chewing food is mastication.
Option C
<u>Explanation</u>:
The food splits into smaller pieces during mastication. As the food is broken down its surface area increases as the size decreases due to which many other enzymes can also act on the masticated food.
Mixing of enzymes occur both during mastication and after mastication. The food is passed down through oesophagus into the stomach where other enzymes and acids are mixed to breakdown the food into further smaller molecules.
If plants are purebred, then they are homozygous. This means that they have the exact same genes in one pair: for example, AA. If they are both purebred, then the dominant gene will win out every time. The answer for this question, then, would be D. Here is a diagram to help you!