Do frogs have a high or low survival rate? Explain?
during 1 mating of frogs, the female lays some 2,000-3,000 eggs in water as the male shed millons of sperm over them. How do these large #'s relate to the frogs fitness for life in water.
Amphibians include frogs, salamanders and caecilians. While these animals as adults can live on land, they must return to water for mating purposes. Their eggs lack a protective shell, as seen in Bird or Reptile eggs. They are gelatinous and must be in the water to stay moist and for the sperm to be able to externally fertilize them. As a result, the chances of a sperm joining to an egg are slim since it is occurring outside the female's body. Also, any of those eggs that become fertilized must develop in the water without any protection. Predators who eat eggs are a threat, as are the chances of the eggs drying out. Reproductive failure is always a risk. Whenever an organism reproduces externally, the number of gametes is usually quite high. This will insure that at least of few of the eggs will become fertilized and develop into a tadpole.