Q:

What is the difference between internal and external fertilization?

A:

Quick Answer

The difference between internal and external fertilization is that internal fertilization occurs inside the body, whereas external fertilization happens outside the body. Fertilization is the process by which a sperm cell and an egg cell unite to form a completely new individual.

Continue Reading
What is the difference between internal and external fertilization?
Credit: Thanasis Zovoilis Taxi Getty Images

Full Answer

External fertilization requires the presence of water for the sperm to be able to unite with the egg. Both eggs and sperm are released into the water, and the sperm must swim to reach the eggs. Organisms that use external fertilization to reproduce must either live in the water or return to the water for reproduction.

With internal fertilization, the presence of water is not needed. Animals that have internal fertilization have completely transitioned to life on land. Fewer young are produced because the mother's body will protect any fertilized eggs from being devoured by predators, so large numbers of eggs aren't needed.

Learn more about Biology

Related Questions

  • Q:

    What is metabolic shock?

    A: Metabolic shock is a symptom of metabolic acidosis, which occurs when the body produces an excess of acid, or cannot rid itself of acid build-up. It can le... Full Answer >
    Filed Under:
  • Q:

    How do amoebas move?

    A: As explained by the University of Massachusetts Amherst, amoebas move by extending projections of their body. Once one of these projections, which are call... Full Answer >
    Filed Under:
  • Q:

    Why are enzymes important?

    A: Enzymes are special proteins that control the speed of certain functions in the body; without them, chemical reactions would take place too slowly to keep ... Full Answer >
    Filed Under:
  • Q:

    Why do we need salt?

    A: People need salt because it helps to maintain water balance in the body. It also supports the transmission of nerve impulses and the proper functioning of ... Full Answer >
    Filed Under:

Explore