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:
Green Leafy Veggies and Oranges.
Explanation:
A, those would probably be an ER doctor
Answer:
Arterial insufficiency is the correct answer.
Explanation:
