Answer:
A.
Explanation:
The vaccine is dead/weakened pathogens injected to cause antibodies. These antibodies will recognize the pathogens if they see them and fight them off.
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A tissue, If you would like to know the whole classification it would be cell-tissue-organ-organ systems-human.
<span>The temperature of the scrotum and testes is regulated by two muscles: the dartos and cremaster muscles. During cold weather these muscles contract the testes closer to the center of the body to maintain the correct temperature for sperm production; during hot weather they expand and sweat glands produce sweat. In the absence of sweat glands, the testes cannot be cooled properly, and sperm production may be affected.</span>
Answer:
Your diaphragm
Explanation:
its responsible for your breathing and well being and contracts up and down
Answer: The common ancestor of humans and chimpanzees had 24 pairs of chromosomes, and at some point in the human lineage, two chromosomes fused end to end, providing some selective advantage.
Explanation: Humans evolved in a different way due to external factors and at some point in the human lineage, two chromosomes blended giving humans a selective lead.