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!!
Please see your prior post.
Sra (aka Mme)
Please check your facts. Internal fertilization occurs inside the body of the female.
"Internal fertilization" is when a sperm cell and an egg cell come together inside the bodies of the parents, instead of outside. It happens when a sperm cell meets an egg cell of the same kind. This method is commonly used by animals that live in water, like sea urchins and salmon.
Here are some simple points that 9/10-year-olds might understand better:
1. Internal fertilization is when a mama and papa animal make babies inside their bodies.
2. This happens when the daddy's special cells (called sperm cells) meet the mommy's special cell (called an egg cell) of the same kind.
3. Animals like fish and sea urchins use internal fertilization because they live in water.
4. Some good things about internal fertilization are that animals don't have to spend a lot of energy finding a mate, and parents can make a lot of babies in one go.
5. But there are also some not-so-good things. For example, a lot of sperm and eggs are made, but only a few will actually become babies. Also, the babies grow outside their parents' bodies, so they're not protected from other animals who might want to eat them.
I hope this helps, and if you have any more questions, feel free to ask!