C. the crust and upper mantle
Answer: When the ball reaches the highest point and stops briefly.
Explanation: All thrown projectiles make a parabola, the peak of the parabola will have the greatest gravitational potential energy.
A person can only show a recessive trait if both of their parents carried at least one copy of each of the recessive allele. The parents do not need to show the trait, as one copy is not enough to reveal it, but they must both carry it.
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