What caused the change in the fireballs velocity as it traveled

Earth’s gravity caused the fireball’s velocity to change.

Explanation:

This is the exact answer on plato or edmentum.

Forces affect how objects move. They may cause motion; they may also slow, stop, or change the direction of motion of an object that is already moving. Since force cause changes in the speed or direction of an object, we can say that forces cause changes in velocity. Remember that acceleration is a change in velocity.  Have a blessed day!! :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.