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Diagram of stages of embryo development to a larval and adult stage. In developmental biology, animal embryonic development, also known as animal embryogenesis, is the developmental stage of an animal embryo. Embryonic development starts with the fertilization of an egg cell (ovum) by a sperm cell (spermatozoon). [1]
The egg is not retained in the body for most of the period of development of the embryo within the egg, which is the main distinction between oviparity and ovoviviparity. [1] Oviparity occurs in all birds, most reptiles, some fishes, and most arthropods. Among mammals, monotremes (four species of echidna, and the platypus) are uniquely oviparous.
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 ...
Sexual reproduction is a type of reproduction that involves a complex life cycle in which a gamete (haploid reproductive cells, such as a sperm or egg cell) with a single set of chromosomes combines with another gamete to produce a zygote that develops into an organism composed of cells with two sets of chromosomes . [1]
Veneration of the cow is a symbol of Hindu community identity. [162] Slaughter of cows is forbidden by law in several states of the Indian Union. [163] The ox is one of the 12-year cycle of animals which appear in the Chinese zodiac. The astrological sign Taurus is represented as a bull in the Western zodiac. [164] Cattle in culture
So, the short version of this debate: Dairy is milk, milk comes from mammals (like cows), and eggs come from chickens (birds). Therefore, they're not dairy. There you go.
Semelparity and iteroparity are two contrasting reproductive strategies available to living organisms. A species is considered semelparous if it is characterized by a single reproductive episode before death, and iteroparous if it is characterized by multiple reproductive cycles over the course of its lifetime.
Here is every type of economic system out there explained with cows: Posted by Mike Hosking. Cows are being used for way more than making milk. From protests like the one above, all the way to ...