Once the sperm are able to swim inside the uterus, what other obstacle must they survive?

Reactants undergo chemical reaction to form products. this chemical equation represents one such reaction. the coefficient for one of the reactants or products is incorrect. which part of the chemical equation is incorrect?

What processes take place before the mature mrna exits the nucleus?

When a population split into two subgroups what is most likely to cause the subgroups to develop different traits?