You need to write a letter a family member explaining what the 11 body systems are,
and their functions. You then need to
explain in detail which system you believe is
the most important and why. Finally,
explain which system you feel is the least
important and why.

Muscular, skeletal, digestive, excretory, nervous, reproductive, respiratory, endocrine, integumentary, urinary, circulatory

Explanation:

The most important body system is the circulatory system. I think this because without it, your body won't get the oxygen it needs to certain organs like your brain and your other internal organs, and then you'll die. And, your body will have a bunch of waste built up because your body's circulatory system takes any waste and carries it to the kidneys, then there it gets filtered.

The system that is the least important is probably the excretory, because you don't need to sweat to cool your body down. You can just stop what you're doing and just wait until your body cools down. But part of me wants to say that this body system is very important, because since the excretory system includes sweating, and sweat is very important because it keeps your body in a state of equilibrium.

the darker peppered moth species were favored due to the fact that the industrial revolution had made all the nearby trees a darker color instead of white.

thrombocytopenia, which is a deficiency in blood platelets, can cause bleeding and bruising in the dermis similar to senile purpura. other possible causes include: exposure to ultraviolet rays and aging skin are common causes of senile purpura. senile purpura may also be a sign of collagen loss in the skin and bones.