A. from the late 1800's to 1994 (yellowstone was established in 1872)

This statment is true.

Explanation:

The Yellowstone was established in March 1st 1872.

This was between the years 1800's to 1994.

If you have any questions feel free to ask in the comments.

endo:

regulates body hormones, aldosterone, vasopressin

neural:

signal, regulates body using electric signals, reflex

endo has to do with hormones; aldosterone and vasopressin are both hormones. i also had this question and got it right : d

c) 50% there are four chromosomes. after crossing over, 2 of the four have been changed. that means any gamete has a 2 in 4 chance or 50% chance of receiving the mutated chromosome.