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Most mammals are viviparous, giving birth to live young. [1] However, the five species of monotreme, the platypuses and the echidnas, lay eggs. The monotremes have a sex determination system different from that of most other mammals. [2] In particular, the sex chromosomes of a platypus are more like those of a chicken than those of a therian ...
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]
Since the 1990s, the series has been divided into two levels. Stage 1 books "explain simple and easily observable science concepts for preschool- and kindergarten-age children." Subjects covered in Stage 1 titles include the human body, plants, animals and "the world around us."
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 ...
For mammals, the gestation period is the time in which a fetus develops, beginning with fertilization and ending at birth. [1] The duration of this period varies between species. For most species, the amount a fetus grows before birth determines the length of the gestation period.
Sometimes the picture is an animal, and the blimp must be guided into the class it belongs to (i.e. mammals, reptiles, and birds), meaning this activity sometimes teaches beginner zoology. It can also teach a variety of other subjects, such as identifying shapes, parts of speech , and the number of syllables in a word.
The Life of Mammals was intended to be his definitive account of the subject. Attenborough took on the series at the suggestion of the BBC Natural History Unit. The naturalist's wife, Jane, had died in 1997, midway through the making of The Life of Birds, which had caused its postponement. However, Attenborough had been grateful for the fact ...
Figure 1:In mammals, the quadrate and articular bones are small and part of the middle ear; the lower jaw consists only of dentary bone.. While living mammal species can be identified by the presence of milk-producing mammary glands in the females, other features are required when classifying fossils, because mammary glands and other soft-tissue features are not visible in fossils.
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