Normally a sperm can easily penetrate the egg, but if another sperm has already entered, or the sperm and/or egg is defective. Ignore the other answer because it merely restates your question. So a sperm can always penetrate an egg unless it is too late or either it or the egg is defected.
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Answer:
vWhat are the major responsibilities of the FDA related to medicine? In general, the FDA is responsible for the regulation of all aspects of medicine in the United States. This includes medicine approval, manufacturing regulation, packaging regulation, control of distribution, and regulation of the place of sale.
The best diagnosis for this disorder is somatic symptoms disorder, which means that the patient has predominant pain pattern. This condition usually occurs when an individual express extreme anxiousness about physical symptoms because of their thoughts and feelings in relation to the symptoms.
