Answer:
In the testicles sperm is produced in coiled structures known as seminiferous tubules The epididymis runs along the top of each testicle. This is a cord-like structure where sperm develop and are stored. When the penis fills with blood and gets erect the release process begins.
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Answer:
an athlete should increase calorie intake.
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Answer:
they have big effects; it usually affects cells, tissues, and systems other than the target cells
Explanation:
A is the central nervous system and i think b is the peripheral nervous system
It is true because heart attack is because of stopping of heart beats which will