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Attached to pregnant women or to cattle, in the skins of animals that have been sacrificed, these stones act as a preventive of abortion, care being taken not to remove them till the moment of parturition; for otherwise procidence of the uterus is the result. If, on the other hand, they are not removed at the moment when parturition is about to ...
Sponges have a motile larval stage and become sessile at maturity. Conversely, many jellyfish develop as sessile polyps early in their life cycle. In the case of the cochineal , it is in the nymph stage (also called the crawler stage) that the cochineal disperses.
A lithopedion (also spelled lithopaedion or lithopædion; from Ancient Greek: λίθος "stone" and Ancient Greek: παιδίον "small child, infant"), or stone baby, is a rare phenomenon which occurs most commonly when a fetus dies during an abdominal pregnancy, [1] is too large to be reabsorbed by the body, and calcifies on the outside as ...
All cells can be considered motile for having the ability to divide into two new daughter cells. [1] Motility is the ability of an organism to move independently using metabolic energy. This biological concept encompasses movement at various levels, from whole organisms to cells and subcellular components.
External fertilization is a mode of reproduction in which a male organism's sperm fertilizes a female organism's egg outside of the female's body. [1] It is contrasted with internal fertilization, in which sperm are introduced via insemination and then combine with an egg inside the body of a female organism.
In plants, nuclear genes are inherited from both parents, but all the cytoplasmic genes come from the mother. This allows male gametes to be smaller and more motile while female gametes are larger. It makes sense for most plants to be hermaphrodites, since they are sessile and unable to find mates as easily as animals can. [11]
It’s that time of year when it seems like everyone has a cold, the flu, or at least the sniffles. When you’re under the weather, whipping up dinner—or any meal—can feel less like a chore ...
During its motile form, the free-swimming telotroch appears as a long cylinder, moving quickly and erratically. Stalk materials are secreted in order for the cell to become sessile. Stalk precursors are held in dense granules at the aboral or basal end of the telotroch, which are released as a liquid by exocytosis. That liquid solidifies to ...