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Sperm cannot fly. Really, it´s that simple. Sperm can´t survive in open air, so it has to be delivered directly to the egg. That´s why we have penises ;) Sperm can survive in water, so fish can just let it all out and let it meet halfway between their bodies. That´s what spawning is; external fertilization.
What else can I help you with?
What evidence is there that land animal mainly carry out internal fertilisation?
Birds, mammals and reptiles carry out internal fertilization. This is evidenced by the fact that the eggs are stored internally during fertilization. The egg develops inside of the mother.
How is the dirty air polluation made?
In nature it is the raising of dust (fine ground rock) by wind or "scuffing" of animals. These days its mostly from fine particulates from machinery, mainly internal combustion engines.
Why do fishes use external fertilisation?
Mainly fishes are living in water and they are not having the proper fertilization system in side its structure, so they prefer external fertilization process.
Are the carbohydrates you ingest mainly from animals?
no
How does incubation differ from fertilization?
Fertilization refers mainly to the sperm meeting the egg and the process leading to that moment.Incubation occurs after the egg has been fertilized when the egg is being heated and as the chicken is being formed.
What are methods in sexual reproduction in animals?
Reproduction in most mammals involves internal fertilization by the male of one or more eggs in the female. The most common method of delivery is the placental form, where fairly well-developed offspring develop in the uterus and are born live. The other two delivery methods are 1) the marsupial, where a less-developed offspring leaves the uterus through the vagina and travels to a pouch where it completes its maturation. 2) the monotreme, where the fertilized embryo is encased in an egg, as with most birds and reptiles, and develops mainly there, then hatches in a burrow where it begins to suckle on the mother.
What animals live in the Strzelecki Desert?
mainly native australian animals and camels:)
What do vultures mainly eat?
dead animals
What animals are predators to worm?
Mainly birds
What type of animals are found in new England colinies?
Mainly domestic animals. The farmers depend on these animals for meat.
What kinds of animals do Africans eat?
Mainly elephants
What jobs did animals do?
they were mainly the same as the ones we do today. some of them were different and some animals were used in the war for different things. as i said they were mainly the same as ones we have today.
