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Há 6 dias · Salamandroidea. Native distribution of salamanders (in green) Salamanders are a group of amphibians typically characterized by their lizard -like appearance, with slender bodies, blunt snouts, short limbs projecting at right angles to the body, and the presence of a tail in both larvae and adults. All ten extant salamander families are grouped ...
Há 6 dias · It allows carbon dioxide to exit the egg and oxygen gas to enter the egg. The albumin (9) further protects the embryo and serves as a reservoir for water and protein. The allantois (8) is a sac that collects the metabolic waste produced by the embryo. The amniotic sac (10) contains amniotic fluid (12) which protects and cushions the embryo.
Há 6 dias · Tuatara eggs have a soft, parchment-like 0.2 mm thick shell that consists of calcite crystals embedded in a matrix of fibrous layers. It takes the females between one and three years to provide eggs with yolk, and up to seven months to form the shell. It then takes between 12 and 15 months from copulation to hatching.
Há 4 dias · All birds lay amniotic eggs with hard shells made mostly of calcium carbonate. Hole and burrow nesting species tend to lay white or pale eggs, while open nesters lay camouflaged eggs. There are many exceptions to this pattern, however; the ground-nesting nightjars have pale eggs, and camouflage is instead provided by their plumage.
Há 2 dias · Abortion is the termination of a pregnancy by removal or expulsion of an embryo or fetus. [nb 1] An abortion that occurs without intervention is known as a miscarriage or "spontaneous abortion"; these occur in approximately 30% to 40% of all pregnancies. [2] [3] When deliberate steps are taken to end a pregnancy, it is called an induced ...
Há 2 dias · Elephants are the largest living land animals. Three living species are currently recognised: the African bush elephant ( Loxodonta africana ), the African forest elephant ( L. cyclotis ), and the Asian elephant ( Elephas maximus ). They are the only surviving members of the family Elephantidae and the order Proboscidea; extinct relatives ...
7 de mai. de 2024 · Ce este lichidul amniotic? Lichidul amniotic este un fluid limpede, transparent, galbui, ce poate fi regasit in interiorul sacului amniotic inca din ziua 12 dupa conceptie. Acest fluid inconjoara fatul in interiorul uterului, are numeroase functii si este absolut esential pentru dezvoltarea normala a bebelusului.
