There are trillions of cells within the human body, many of which are specilalized to perform specific functions. Red blood cells contain no nucleus or other organelles so allowing room for the oxygen carrying haemoglobin, smooth muscle cells are elongated and can shorten to allow for muscle contraction. Within all cells (except the RBCs) are organelles such as the nucleus and mitochondrion, and these organelles perform functions that are essential to life.
Answer:
having sexual intercourse
Con·cen·tra·tion
/ˌkänsənˈtrāSH(ə)n/
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noun
1.
the action or power of focusing one's attention or mental effort.
"frowning in concentration"
Answer: Skeletal Muscle
Explanation:
The muscular system is an organ system consisting of skeletal, smooth and cardiac muscles. It’s the movement of the body, and circulates blood throughout the body.
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Answer: Reproduction. One must reproduce in order to continue the generational line.
