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Life cycle and pathology [ edit ] 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 .
The different stages of mitosis all together define the M phase of an animal cell cycle—the division of the mother cell into two genetically identical daughter cells. [3] To ensure proper progression through the cell cycle, DNA damage is detected and repaired at various checkpoints throughout the cycle.
G 1 phase together with the S phase and G 2 phase comprise the long growth period of the cell cycle cell division called interphase that takes place before cell division in mitosis (M phase). [1] During G 1 phase, the cell grows in size and synthesizes mRNA and protein that are required for DNA synthesis. Once the required proteins and growth ...
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. [ 4 ]
Unicellular organisms are thought to be the oldest form of life, with early protocells possibly emerging 3.5–4.1 billion years ago. [1] [2] Although some prokaryotes live in colonies, they are not specialised cells with differing functions. These organisms live together, and each cell must carry out all life processes to survive.
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 ...
Multicellular organisms arise in various ways, for example by cell division or by aggregation of many single cells. [4] [3] Colonial organisms are the result of many identical individuals joining together to form a colony. However, it can often be hard to separate colonial protists from true multicellular organisms, because the two concepts are ...
In the United States, about one out of 365 African-American children and one in every 16,300 Hispanic-American children have sickle cell anaemia. [146] The life expectancy for men with SCD is approximately 42 years of age while women live approximately six years longer. [147] An additional 2 million are carriers of the sickle cell trait. [148]
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