please explain
2007-12-08 05:46:35 · 5 answers · asked by asad a 1 in Science & Mathematics ➔ Zoology
In frog the fertilization is external. The probability of a sperm meeting with an egg is low compared to chickens where the fertilization is internal. The sperms of chicken get into the oviduct and are thus ensured a proper environment where the probability of fertilization is high.
2007-12-10 20:48:37 · answer #1 · answered by Ishan26 7 · 0⤊ 0⤋
Tadpoles have a lot of predators; also, most frogs do not look after their young so they're more vulnerable. This means that most of the tadpoles will never reach adulthood. The only way a frog can ensure that some will survive long enough to perpetuate the species is by laying LOTS of eggs.
2007-12-08 13:58:11 · answer #2 · answered by Nature Boy 6 · 0⤊ 0⤋
They are amphibians, not aves, and need to make more offspring to ensure survival. Remember the purpose of life to to make more life. Animals reproduce and try to ensure the survival of their species. Bird and reptile eggs are amniotic eggs and can survive without water. They can live longer. This animal adaptation ensures that young can survive. Frog eggs (later tadpoles) must have water to survive.
2007-12-08 16:21:29 · answer #3 · answered by Jennie K 2 · 0⤊ 0⤋
when something in nature is likely to bring death to a lot of eggs, nature counters that tendency by producing enough to have some get through
2007-12-08 17:38:50 · answer #4 · answered by Anonymous · 0⤊ 0⤋
Most would be eaten by fish so some would survive to grow
2007-12-08 13:54:41 · answer #5 · answered by howard.gilman 2 · 0⤊ 0⤋