The main center for control of the internal environment of the body takes place in the .
a. adrenal glands
b. thyroid gland
c. cerebellum
d. hypothalamus and pituitary
e. medulla

E.

Explanation:

The medulla is easily the most important part of the brain. We would not be able to live without the medulla because of the crucial task it performs including regulating blood pressure and breathing. As part of the brain stem, it also helps transfer neural messages from the brain to the spinal cord.

the answer is; comparing the frequency of collisions with and without the device

this makes the anti-collision system an independent variable and the collisions a dependent variable. if there are fewer collisions with an anti-collision system that without, then it can be stated that the system is a success. essentially, collisions under an anti-collision system are compared with the frequency of collisions by cars with the human drivers.

substitution is the answer in this case