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Because they only can produce little offspring, unlike fish who produce millions of eggs and fertilize them afterward. Also, reptile and bird egg shells are tough making it hard to fertilize when fish eggs are more like jelly.
June Douglas
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is a bird an animal reproduction or external fertilization?
Both internal and otherwise.Reproduction in birds is quite complicated . Birds reproduce sexually and have separate sexes and internal fertilization, so males and females must mate for fertilization . Mating is generally preceded by courtship. In most species, parents also take care of their eggs and hatchlings.
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.
Do whales fertilize internally or externally?
Whale has internal fertilization,because they are mammals like human. ^_^
Which dinosaur is considered by scientists to be a reptile but not a dinosaur?
Your question is logically impossible. You must mean, "What prehistoric reptile is not considered by scientists to actually be a dinosaur?" The answer is that there were many mammal-like reptiles that predated the dinosaurs and were not dinosaurs. One example being Dimetrodon, which went extinct millions of years before the first dinosaurs evolved. Dinosaurs were not reptiles, but shared characteristics with both reptiles and birds. They were actually more like birds.
Why in animal fertilization are there generally more egg and sperm cell produced during external fertilization than during internal fertilization?
I'm no expert, but I'm fairly sure that the environmental conditions (ie. air temp) makes quite a big difference
Which gases must travel across a reptile egg?
carbon dioxide
Why must external fertilization in animals always occur in water?
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.
Which process must occur before any division can take place?
Fertilization
What must happen before the fertilization process can happen in pea plants?
The flowers must be open and contain ripe pollen.
Which process must occur before any cell division can take place?
Fertilization
Do ferns require water for fertilization?
Yes. The soil must be kept moist, but not OVERWATERED!
In order for the sperm cell to achieve a diploid state what must occur?
Fertilization
