When someone stands with their knees locked, they may feel dizzy, nauseous, and possibly faint due to a drop in blood pressure. this resulting drop in blood pressure would be classified as the
a
stimulus
b
sensor
c
control center
d
effector

C

Explanation:

The Stimulus is the fact of being with your knees locked. The sensors are the  nervous fibers that receive the sensation of feeling dizzy. The effectors are the muscles that respond to the stimulus.

for 8 am not sure maybe yes?

for 9 if it is asking if the male is more or less it would be less

hope i even just a little : )

i'm guessing this is from edg enuity so the answers would be, from top to bottom,

theodor schwann

matthias schleiden

robert hooke

rudolph virchow

anton van leeuwenhoek