What are the similarities of internal external fertilization?

Answer 1

Internal fertilization takes place inside the body of the female. It is necessary for animals which live on land (terrestrial animals) and is retained by aquatic animals descended form terrestrial ancestors eg whales and dolphins.

External fertilization takes place outside the body of the female. It usually takes place in water, usually the environment in which the animal lives eg fish and amphibians. This is because eggs and sperm would dry out and die if they are not kept wet.

Internal fertilization is more certain than external fertilization so fewer eggs need to be produced.

After internal fertilization eggs can be protected and fed while developing inside the mother's body. After external fertilization the eggs are potentially exposed to predators and so must either be produced in very large numbers or protected by the parents or both.

Answer 2

Internal fertilization is a form of animal fertilization of an egg by sperm within the body of an inseminated animal, whether female or hermaphroditic. This is distinct from external fertilization, where the union of the ova and spermatozoa occur outside of the organism.

Answer 3

External fertilization is a form of fertilization in which a sperm cell is united with an egg cell external to the bodies of the reproducing individuals. In contrast, internal fertilization takes place inside the female after insemination through copulation.

In sexual reproduction, there must be some way of getting the sperm to the egg. Since sperm are designed to be mobile in a watery environment (they have tails and are streamlined), aquatic animals can make use of the water in which they live. Many plants make use of external fertilization, especially ones without bright flowers or other means of attracting animals. In many aquatic animals such as coral or hydra, eggs and sperm are simultaneously shed into the water, and the sperm swim through the water to fertilize the egg in a process known as broadcast fertilization. In many fish species, including salmon, the female will deposit unfertilized eggs in the substrate and the male will swim by and fertilize them. External fertilization uses or needs thousands of sperm cells

External fertilization is a form of fertilization in which a sperm cell is united with an egg cell external to the bodies of the reproducing individuals. In contrast, internal fertilization takes place inside the female after insemination through copulation.

In sexual reproduction, there must be some way of getting the sperm to the egg. Since sperm are designed to be mobile in a watery environment (they have tails and are streamlined), aquatic animals can make use of the water in which they live. Many plants make use of external fertilization, especially ones without bright flowers or other means of attracting animals. In many aquatic animals such as coral or hydra, eggs and sperm are simultaneously shed into the water, and the sperm swim through the water to fertilize the egg in a process known as broadcast fertilization. In many fish species, including salmon, the female will deposit unfertilized eggs in the substrate and the male will swim by and fertilize them. External fertilization uses or needs thousands of sperm cells

External fertilization

During external fertilization, many gametes are released into the water by each sex at the same time and place.

This type of fertilization requires water because animal sperm must swim to the eggs. Water also protects the gametes from drying out.

Species which have external fertilization are either aquatic or return to water for reproduction.

Internal fertilization

Internal fertilization is practiced by species that lay shelled eggs or have a period of internal embryonic development.

This type of fertilization enables animals to reproduce in a terrestrial environment because it enables sperm to swim to the egg and it prevents gametes from drying out.

The male often has a copulatory organ (a penis) for transferring sperm.

Answer 4

the similarity is the both have sometin that goes into the body!

Answer 5

Both external and internal fertilization involve sex

Answer 6

for external fertilization

Answer 7

sperm fuses with the egg cell to form a zygote