The correct answer for this is sperm. Hope this helps.
The second statement best explains the type of blood vessel and the function of these vessels' valves - <span>These are veins, which prevent the backflow of blood because the walls have little muscle to pump blood back to the heart.
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Veins are large blood vessels which carry blood back to the heart. <span>Veins have a system of valves to prevent back-flow.</span>
Answer:the answer is b
generalized anxiety
panic disorder: Sudden and repeated panic attacks of overwhelming anxiety and fear. A feeling of being out of control, or a fear of death or impending doom during a panic attack.
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Answer:
Correct, common illnesses caused by: Bacteria
Explanation:
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<span>Chronic infection, especially when it is caused by certain high-risk HPV types, can eventually cause certain cancers, such as cervical cancer. Although there is currently no cure for HPV infection, there are ways to treat the warts and abnormal cell growth that HPV causes.</span>Dec 5, 2016<span>
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