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3 years ago

Who developed the modern model of the solar nebular disk instability model?

Biology

2 answers:

Varvara68 [4.7K]3 years ago

4 0

It would be traced to victor safronov

Oksanka [162]3 years ago

3 0

Answer:

George Wetherill and Victor Safronov

Explanation:

The modern model known as "solar nebular disk instability model" was developed by George Wetherill after refining the basic modern model developed by Russian astronomer Victor Safronov in 1970. According to this model, dust and gases resulted into massive clumps during the early stage of formation of solar system. This model well explains the formation of star, sun, solar system, planet, asteroids and comets.

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What kind of claim type does this statement make? Abbey Road is a much better album than Let It Bleed.

shtirl [24]

A . Value because that’s your valued opinion

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2 years ago

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Describe how carbon skeletons may vary, and explain how this variation contributes to the diversity and complexity of organic mo

Alecsey [184]

Carbon skeletons may vary in length, shape, number and location of double bonds and other elements covalently bonded to available sites.

A carbon atom contains four valence electrons thus, exhibiting a strong tendency to make covalent bonds with other atoms so as to complete its octet. Covalent bonds join carbon atoms together in long chains that create the skeletal framework for organic molecules.

A carbon atom could be linked to as many as four additional carbon atoms in an organic compound. Carbon atoms can also quickly form double bonds (where four electrons are shared among two atoms) and triple bonds (where six electrons are shared).

This variation in carbon skeletons contributes to the diversity and complexity of organic molecules.

To learn more about covalent bonds here

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1 year ago

5. There is a solid wooden table with a cup of water sitting on it. Which of the following statements

White raven [17]

Answer: Option D.

The atoms and molecules of the liquid water are moving, and the atoms and molecules of the

table are not moving.

Explanation:

The atoms and molecules of the liquid water are moving, and the atoms and molecules of the table are not moving and this is because the atoms and molecules of liquid water are closely packed together and they collide to each other often, thereby moving in random motion in all directions.

The molecules of solid cannot move because they are closely packed together and there is a very strong of attraction which make them to only vibrate and not move and this make solid to have definite shape.

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3 years ago

how many more atoms does ethylene have than carbon monoxide? list the type and number of each atoms PLEASE HELP ME

Valentin [98]

Carbon Monoxide has 2 atoms total - one atom of carbon (C) and one atom of oxygen (O) chemical formula is CO

Ethylene has 6 atoms total, 2 atoms of carbon (C) and 4 atoms of hydrogen (H), chemical formula is C2H4.

Ethylene has four more atoms than carbon monoxide (6-2) = 4

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3 years ago

Q - Describe the Mitoses with the help of diagram. write its different phares and explain them.

bonufazy [111]

Answer:

Mitosis is a type of cell division in which single haploid cell (n) or diploid cell (2n) divides into two haploid or diploid daughter cells that are same as the parent.

Mitosis occurs in somatic cells of plants and animals. In this cell division, the two daughter cells have the same number of chromosomes as that in the parent cells.

Mitosis consists of four basic phases: prophase, metaphase, anaphase, and telophase.

1.Prophase:-

It is the first visible stage in karyokinesis. The chromosomes appear as long coiled threads called chromatids. The chromatin becomes shorter, thicker and visible due to the condensation of DNA. The chromatins are now called chromosomes. Stainability of nucleus increase. Each chromosome starts to splits longitudinally into two sister chromatids. These sister chromatids are attached to each other at the centromere. The nuclear membrane and nucleolus start to disappear and by the end, it will be completely disappeared.

ii. Metaphase:-

Nuclear membrane and nucleolus completely disappears and simultaneously appearance of spindle fibers. Spindle fibers are attached to the centromere of a chromosome. The chromosomes are arranged on the equatorial plane. The process of gathering of chromosomes in equator is called congressional and plate formed is called metaphasic plate.

iii. Anaphase:-

The centromere of each chromosome splits into two sister chromatids and forms two daughter chromosomes. The daughter chromosomes are pulled towards the poles due to the contraction of spindle fibres and stretching of interzonal fibers. During polar movement, the chromosomes show different shapes i.e. J, U, V, L or I shaped in appearance. At the end of anaphase, each pole will get one set of daughter chromosomes. It is the shortest phase and is also known as a migratory phase.

iv. Telophase:- The daughter chromosomes reach respective poles and uncoil and become thin, long and visible. The spindle fibres start disappearing and finally disappear. The nuclear membrane and the nucleolus reappear.

Two nuclei are formed at the end of telophase. Both the nuclei have the same number of chromosome as the parent cell. It is the last visible stage of karyokinetic and is also known as reorganization phase.

It is followed by cytokines or division of cytoplasm.

Explanation:

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2 years ago