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The egg cell is generally asymmetric, having an animal pole (future ectoderm).It is covered with protective envelopes, with different layers. The first envelope – the one in contact with the membrane of the egg – is made of glycoproteins and is known as the vitelline membrane (zona pellucida in mammals).
After ovulation, in placental mammals, the endometrial lining becomes hypertrophic and vascular under the influence of the sex hormones, estrogen and progesterone. In animals exhibiting hemochorial placentation, the endometrium undergoes decidualization following implantation.
Chelsea Clinton's cat Socks (1989–2009) lived in the White House from 1993 to 2001. Socks was a bicolour cat with low-grade spotting, or tuxedo cat.. A bicolor cat (also bi-colour cat or Tuxedo Cat) is a cat with white fur combined with fur of some other colour, for example, solid black, tabby, or colourpointed. [1]
In live bearing mammals, the placenta forms after the embryo implants into the wall of the uterus. The developing fetus is connected to the placenta via an umbilical cord. Mammalian placentas can be classified based on the number of tissues separating the maternal from the fetal blood. These include: endotheliochorial placentation
A retained placenta is a placenta that does not undergo expulsion within a normal time limit. Risks of retained placenta include hemorrhage and infection. If the placenta fails to deliver in 30 minutes in a hospital environment, manual extraction may be required if heavy ongoing bleeding occurs.
The class Mammalia is divided into two subclasses based on reproductive techniques: monotremes, which lay eggs, and therians, mammals which give live birth, which has two infraclasses: marsupials/metatherians and placentals/eutherians. See List of monotremes and marsupials, and for the clades and families, see Mammal classification ...
Cats pant after playing to keep themselves from overheating. Cats only sweat through the paws, so cooling down can be harder for them especially if they are one of the longhaired cat breeds .
Heterozygous cats have somewhere between 0-50% white. homozygote (W l or SS)=low degree of spotting white (between 50 and 100% white); dominant harlequin and van pattern. The van pattern is named after the Lake Van region in Turkey, and expresses as coloration limited to the head and tail. w (or N)=wild-type or normal (non-white coats ...