In order for natural selection to take place we must have "variety in a population". This variety of traits is what allows natural selection to "pick" the most favorable traits.
A complex chemistry is most related to maintaining a stable internal environment.
Bee sting in a child is really a
concern than with the adult because this would cause anaphylaxis, which is a
fatal reaction of severe allergy. The effects are swelling, sweating, and pain,
difficulty in breathing, dizziness and shock. In this life-threatening
scenario, infant really needs immediate care for their immune system and other
body organs are not yet fully develop to fight for the allergic reaction.
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A function of the nucleus is D) Storing genetic material.