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In biology, a biological life cycle (or just life cycle when the biological context is clear) is a series of stages of the life of an organism, that begins as a zygote, often in an egg, and concludes as an adult that reproduces, producing an offspring in the form of a new zygote which then itself goes through the same series of stages, the ...
[a] [20] All animals are motile [21] (able to spontaneously move their bodies) during at least part of their life cycle, but some animals, such as sponges, corals, mussels, and barnacles, later become sessile.
Their eggs and resistant life-cycle stages (cysts and tuns) are small and durable enough to enable long-distance transport, whether on the feet of other animals or by the wind. [3] Individual species have more specialised distributions, many being both regional and limited to a single type of habitat, such as mountains. [6]
In animals, the process involves a sperm fusing with an ovum, which eventually leads to the development of an embryo. Depending on the animal species, the process can occur within the body of the female in internal fertilization, or outside in the case of external fertilization. The fertilized egg cell is known as the zygote. [2] [5]
On the class' first "normal" field trip to the zoo, they wonder how the animals could live in the city. The Friz then turns them into various city animals (Tim, Arnold, and Phoebe into foxes ; Ralphie, Wanda, and Keesha into opossums ; Dorothy Ann and Carlos into peregrine falcons, and herself into a raccoon ), but the magic school bus mistakes ...
The Life of Mammals is a nature documentary series written and presented by David Attenborough, first transmitted in the United Kingdom from 20 November 2002. It is a documentary on the study of the evolution and habits of the various mammal species.
A dragonfly in its radical final moult, metamorphosing from an aquatic nymph to a winged adult.. In biology, moulting (British English), or molting (American English), also known as sloughing, shedding, or in many invertebrates, ecdysis, is a process by which an animal casts off parts of its body to serve some beneficial purpose, either at specific times of the year, or at specific points in ...
Myxozoans are endoparasitic animals exhibiting complex life cycles that, in most of the documented cases, involve an intermediate host, usually a fish, but in rare cases amphibians, [7] reptiles, [7] birds, [8] and mammals; [9] [10] and a definitive host, usually an annelid or an ectoproct. Myxozoan life cycle