Help!! #3 (URGENT)

What is "internal fertilization" and how does it happen? What kind of animals use this method? List a few animals. give two advantages and two disadvantages.

What is it: when a sperm cell and an egg cell unite outside the bodies of the parents.

How does it happen: if a spermcell comes in contact with an egg cell of the same species, fertilization may occur.

Who uses it: it is commonly used amongst aquatic animals. Example, sea urchins and salmon.

2 advantages: very little energy is required to find a mate. Large numbers of offsrping are produced at one time.

2 disadvantages: millions of gametes are released but many won't survive. zygotes and embryos form outside of parents' bodies are unprotected and preyed upon.

How could I change any of this so that 9/10 year olds can understand?

Thank you very much!!

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  1. Please see your prior post.

    Sra (aka Mme)

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  2. Please check your facts. Internal fertilization occurs inside the body of the female.

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