Answer:
The Hay-flick Limit is a concept that helps to explain the mechanisms behind cellular aging. The concept states that a normal human cell can only replicate and divide forty to sixty times before it cannot divide anymore, and will break down by programmed cell death or apoptosis.
Metaphase is the phase where they become noticeable, because they are lined up in the middle
The heart, the blood vessels, lymphatic system (or defense system), and the blood are the four main parts of the circulatory system.
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A) this is an example of codominance when in the heterozygous form both genes manifest
we'll say that F-red feathers; f-white feathers
B)50% will have spotted feathers
c)0% wil have red feathers
