The microscope antoine van leeuwenhoek discover "little animalcules" which were really the first descriptions of microscopic items such as: a. bacteria b. all of the above c. red blood cells d. protozoa and algae

The answer is bacteria. Red blood cells, Protozoa, and algae were discovered at a later time in history. He called bacteria "animalcules" because they moved and reproduced under the microscope (sort of like little animals).

When the ball hit the ground, the height of the ball will be zero. So using the value of h(x) as zero in the given equation, we can find the time in which the ball will hit the ground.

0 = -(x-2)^2 + 16

(x-2)^2 = 16

x-2 = 16

x-2 = 4

x = 6

This means the ball will hit the ground 6 seconds after Amir threw it.