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13.11.2019 •
Biology
An oocyte released from a human ovary enters the oviduct as a result of
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Ответ:
An oocyte released from human ovary enters the oviduct as a result of wavelike motion of beating cilia present inside the oviduct.
Explanation:
The ovum is released from the grafiaan follicle during the ovulatory phase of Menstrual cycle.It is caused by the increasing turgidity and contraction of smooth muscle fibres around the Graafian follicle.During ovulation the ovum is at secondary oocyte stage.Ovum released from the Graafian follicle is trapped by the fimbriae of the ampulla of fallopian tube.Then the ovum moves into the oviduct towards the uterus by peristalsis and ciliary action of the walls of oviduct which is made up of ciliated columnar epithelium.Ответ:
1.light colored morph easier to see on a dark tree trunk.
2.dark colored morph easier to see on a light tree trunk.
Explanation:
Before the 19th century in England, the air was very clean due to low industries in England due to which population of light colored peppered moth increases because they are unable to see by the birds while dark colored peppered moth decrease in number and eaten by the birds because they are easier to see. But after 19th century, when industrial revolution occurs, the color of plants changes due to the presence of black powder on the surface of leaves due to smoke of industries. Due to this, dark colored peppered moth are unable to see by the birds and they increase in number while light peppered moth decrease in population due to easier seen by the birds. Nature selects those species which have more fitness and survival abilities. After 19th century, dark colored peppered moth increase in population due to high fitness and able to hide from birds.