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Kay [80]
3 years ago
14

Which is the final event that occurs when a star is forming?

Biology
1 answer:
DiKsa [7]3 years ago
6 0

Answer:

D. Nuclear fusion begins under high pressure.

Explanation:

A star is a giant astronomical or celestial object that is comprised of a luminous sphere of plasma, binded together by its own gravitational force.

Some of the examples of stars are;

  • Canopus.
  • Sun (closest to the Earth)
  • Betelgeuse.
  • Antares.
  • Vega.

Stars are typically made up of two (2) main hot gas, Hydrogen (H) and Helium (He). The chronological order in which the formation of a star occur are;

1. Gravity pulls gas and dust together to form dense cores.

2. A protostar forms as mass increases.

3. Nuclear fusion begins under high pressure.

Hence, the final event that occurs when a star is forming is that nuclear fusion begins under high pressure.

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Explain why the lining of the uterus thickens and develops blood vessels between day 5 and day 14 in the menstrual cycle.
enyata [817]

Answer:

The endometrium is the mucous layer that lines the uterus internally. Its function is to thicken during the menstrual cycle to allow the embryo to implant and a pregnancy can take place.Two phases of the endometrial cycle are distinguished: the proliferative phase and the secretory phase. The proliferative endometrium occurs due to tissue regeneration on the first day of the menstrual cycle, where, thanks to the production of estrogen in the ovary, cell multiplication occurs, giving rise to the endometrial glands and more blood vessels.

Explanation:

The first phase, known as the follicular phase, begins on the first day of menstrual bleeding and lasts for about two weeks. During this period, one of the ovules - which are the female reproductive cells - grows and matures within an ovary. At the same time, the ovaries produce hormones that promote the development of the lining of the uterus, called the endometrium. The lining of the uterus, the endometrium, thickens in response to estrogen stimulation, that is, over the days, the endometrium becomes thicker and rich in blood vessels, preparing to receive the egg the moment it is expelled from the ovary. When the ovum matures, around day 14 of the cycle, it separates from the ovary - the ovulation process - and slides down the fallopian tube to the uterus.

7 0
3 years ago
explain how it helps in increasing the shelf life of fruits and vegetables based on membrane transport​
motikmotik

Answer: There are two categories of cross membrane transport, active and passive. While active transport requires energy, passive transport relies on concentration differences inside and outside of the membrane. With films that cover the outermost membrane of the fruit (the skin), this concentration gradient can be removed or slowed so membrane transport is also slowed and as a result, the fruit stays fresh longer. A good analogy for this is considering evaporation in an open jar on a hot day versus if there was a lid on the jar. Both jars would be in the same conditions, but the jar with the lid would retain more water.

Explanation: have a great day:)

8 0
2 years ago
What is the only insect that can turn its head 180 degrees
belka [17]

Answer:

The Praying Mantis, it can actually turn its head a full 360.

5 0
4 years ago
Read 2 more answers
During transcription, enzymes bind to a molecule of DNA.
Hunter-Best [27]
Replication thats the answer because my teacher we just know doing this
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HELP!!!! Which factor is most likely to have contributed to the high fertility rate in Africa?
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Answer:B

Explanation: Someone told me

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