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.
Hope this helps!
Answer: If she is taking care of herself and is well rested, that is enough sleep for her body.
Signs of positive mental wellbeing:
improve coping ability
signs of high self esteem
contributing to community
signs of positive emotional well-being:
being hopeful about yourself
The answer to your question is B
A. influenza
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