Comma usage.
We grow carrots lettuce radishes and tomatoes in our backyard garden.

We grow carrots, lettuce, radishes, and tomatoes in our backyard garden.

Explanation:

This would be the answer, as commas in this instance are used to separate options in a list. If you were to separate options in multiple lists (i.e, "There are two ways to write: with a pen or pencil, which is inexpensive and easily accessible; or by computer and printer, which is more expensive but neat.")

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the correct answer is:

from context clues heliotrope is probably a flower.

a heliotrope are peruvian plants that have small purplish plants.

explanation:

it refers to the definition of full-contact sports, where the condition is that the sport must have athletes must "purposely collide with each other