For the first half of your question, plants do need to eat. In fact, they are autotrophs, which means they are self feeders.
Sweat, mucus, tears, and saliva all contain enzymes that kill pathogens.
I believe the answer is C.
Answer: a vector
Explanation:
A Vector is a physical quantiy that has can magnitude and direction. Examples of vectors are Velocity, acceleration, force, momentum etc
Now, since velocity is defined as the displacement experienced by an object in a specified direction, it is therefore correct to call velocity a vector
