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Why must external fertilization in animals always occur in water?
Wiki User
∙ 11y ago
Not all species that are aquatic use external fertalization. Dolphins se internal fertilization but it is very dificult because they would have to evolve adapted sexual organs and i dont think fishes have the right organs for internal fertalizations so they juust eject it into water. I'm not sure this is correct but i hope it helps. You might nneed to check it before you use it in any peices of writing.
Wiki User
∙ 11y ago
Anonymous
hello
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What are the similarities of internal external fertilization?
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.
Where does fertilization occur in a female sheep?
In the fallopian tube and uterus.
Do spiders have interenal or external fertilization?
In most instances, both sexes of arthropods occur separately. Males commonly pass sperm to females in sealed packets called spermatophores. The males lay these packets on the ground, and the females later pick them up, or the male deposits them into the female's genital opening. Among crustaceans, millipedes, spiders, mites and some insects, males transfer sperm directly to females. Source: MSN encarta
Why do female dogs lock on to the male dog when matting?
This locking up is to ensure that fertilization will occur. The male has the ability to lock up, not the female.
When does lactic acid fermentation occur in animals?
2+2=4 :))
What type of fertilization and development occur in the zebrafish?
The kind of fertilization and development that takes place in aquatic animals is known as External fertilization.
What adaptations in aquatic animals help ensure that external fertilization will occur?
produce more eggs
What are some environments in which external fertilization can occur?
Water would be the number one choice.
What are the similarities of internal external fertilization?
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.
When does fertilization in mitosis occur?
Fertilization does not occur in mitosis. Fertilization signals for the start of mitotic division in embryos.
Describe where pollination and fertilization occur?
Fertilization occurs in the ovule
How does water aid the fertilization of some organisms?
Depending on the species, fertilization can occur internally or externally. Water aids the fertilization of some organisms because organisms that reproduce externally need water for fertilization to occur.
Where does fertilization occur in a plant?
ovary
Where and when does fertilization occur?
Fallopian Tubes
Fertilization in mammals occur in the?
Fallopian tubes
The tube in which fertilization occur?
The Fallopian tubes.
Where in the body does fertilization occur?
the fallopian tubes
