Genetic variation occurs.
Mutations are not copied over and over again.
Answer:
There are three main parts of the midbrain - the colliculi, the tegmentum, and the cerebral peduncles. Of the 12 cranial nerves, two thread directly from the midbrain - the oculomotor and trochlear nerves, responsible for eye and eyelid movement.
Explanation:
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It's phase contrast microscopy
Because you need to contrast to see the specimen
<span>The phase of mitosis during which the mitotic spindle begins to form is
PROPHASE.
</span>At prophase, the nuclear envelope is broken down; the chromosomes disperse into the cytoplasm, condenses and become visible;
and more importantly, the mitotic spindle fibers form.