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In mathematics, the genus is a classification of quadratic forms and lattices over the ring of integers. An integral quadratic form is a quadratic form on Z n, or equivalently a free Z-module of finite rank. Two such forms are in the same genus if they are equivalent over the local rings Z p for each prime p and also equivalent over R.
The non-orientable genus, demigenus, or Euler genus of a connected, non-orientable closed surface is a positive integer representing the number of cross-caps attached to a sphere. Alternatively, it can be defined for a closed surface in terms of the Euler characteristic χ, via the relationship χ = 2 − k , where k is the non-orientable genus.
Such an adaptation would be "exceptionally difficult" because of the need for male and female genital structures to change at the same time. [ 4 ] Female penetration of males is known in a few species, such as seahorse , but only Neotrogla females have a well-defined organ that can be described as a penis. [ 3 ]
The ZW sex-determination system is a chromosomal system that determines the sex of offspring in birds, some fish and crustaceans such as the giant river prawn, some insects (including butterflies and moths), the schistosome family of flatworms, and some reptiles, e.g. majority of snakes, lacertid lizards and monitors, including Komodo dragons.
Z. californianus (Lesson, 1828) Pacific North American coast (dark blue indicates breeding grounds) Size: 165–220 cm (65–87 in) long; 275–390 kg (606–860 lb) [23] Habitat: Neritic marine, oceanic marine, intertidal marine, and coastal marine [24] Diet: A variety of fish and squid [24] LC 180,000 [24] Galápagos sea lion. Z. wollebaeki
Born right smack on the cusp of millennial and Gen Z years (ahem, 1996), I grew up both enjoying the wonders of a digital-free world—collecting snail shells in my pocket and scraping knees on my ...
Genus (/ ˈ dʒ iː n ə s /; pl.: genera / ˈ dʒ ɛ n ər ə /) is a taxonomic rank above species and below family as used in the biological classification of living and fossil organisms as well as viruses. [1] In binomial nomenclature, the genus name forms the first part of the binomial species name for each species within the genus.
On average, Gen Z men are spending twice as much on weight loss annually than Gen Z women ($714 vs. $360), and they are 1.5 times more likely than Gen Z women to follow a vegetarian or vegan diet ...