Answer:
<h3>Potential energy </h3>
A box resting on the top of a bookcase is an example of <u>potential</u><u> </u><u>energy</u><u> </u>
<span>The answer is to control the crossing of the traits.
The idea of preventing plants from self-pollinating is to control the crossing of the traits. If plants were self-pollinating, he could not know if the traits are inherited from the same plant or from the other. By preventing this, he could cross parents with known phenotype and that way learn about crossing process and inheriting process.</span>
The cornea is the only part of the eye that touches air.
Heart rate, color, irritability, muscle tone, and breathing
