Life Cycle of a Frog Animation
✔ https://HomeworkClinic.com
✔ https://Videos.HomeworkClinic.com
✔ Ask questions here: https://HomeworkClinic.com/Ask
Follow us:
▶ Facebook: / homeworkclinic
▶ Review Us: https://trustpilot.com/review/homewor...
Frogs, toads, salamanders, and caecilians all belong to the Amphibia. Amphibia translates to "double life"-a reference to the amphibian's life cycle, which occurs partly in water and partly on land. Although most amphibians live this double life, a few complete their cycles entirely on land or entirely in water. Our study of the frog's life cycle begins with sexual reproduction. A male entices an egg-carrying female to mate and stimulates her to release her eggs into the water. The male overlays these eggs with a cloud of sperm. Frogs and most other amphibians reproduce through external fertilization.
The fertilized egg, called the zygote, contains all the fat and proteins required for the early phase of frog development. Whether laid on land or in water, the egg must remain moist during development; the egg readily loses water through its delicate envelope if its surroundings are dry.
The single-celled zygote divides many times to form an embryo with thousands of cells. As it develops, the embryo elongates and forms a tailbud. After embryonic development is complete, the embryo hatches and becomes a larva, also called a tadpole. The tadpole has external gills for respiration. These external gills will disappear as the animal continues to develop.
The tadpole will transform itself in a process called meta morphosis, which is controlled by hormones. During metamorphosis, the external gills are replaced by internal gills and hind legs begin to appear. Virtually every organ in the frog changes and becomes suitable for life on land.
Metamorphosis continues as front legs appear and the internal gills are replaced by lungs. The tail begins to be resorbed. The mouth of the larva widens and develops an insect- catching tongue. The tadpole's gut even shortens, preparing the animal for the transition from an herbivorous diet to a carnivorous diet. After a complete metamorphosis takes place, the adult frog is specialized for life on dry land. When the frog reaches reproductive maturity, it completes the life cycle by producing a new generation of frogs.
Amphibians typically live in water or on land during the different
phases of their life cycles. An amphibian’s early development must
take place in a moist environment, because the jelly envelope
surrounding the developing embryo easily dries out. In the case of
the frog, the fertilized eggs then develop into water bound
tadpoles. These swimming creatures are well adapted to their
watery environment—they initially lack legs, they use gills to
respire, and they are herbivores, eating the underwater flora
available to them. However, as they transform into adults, their
bodies prepare for a totally different lifestyle. Practically every organ
of this animal transforms, or metamorphoses, as the tadpole
prepares for life as a land-dwelling, carnivorous frog.
Смотрите видео Life Cycle of a Frog Animation онлайн без регистрации, длительностью часов минут секунд в хорошем качестве. Это видео добавил пользователь Homework Clinic 31 Июль 2024, не забудьте поделиться им ссылкой с друзьями и знакомыми, на нашем сайте его посмотрели 33 раз и оно понравилось 1 людям.