What kind of reactions provide a star with energy? HELP ME

1 answer:

6 0

A star is provided with energy by a nuclear fusion reactions in its core. A nuclear fusion reaction occurs when the nuclei of two atoms combine to create a new atom. Most commonly, in the core of a star, two hydrogen atoms fuse to become one helium atom.

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Earth makes one full rotation on its axis approximately every 24 hours. If Earth's period of rotation decreased to 20 hours, whi

patriot [66]

Answer:

The length of daylight and nighttime would decrease.

Explanation:

If 24 hours was decreased to 20, it would shorten night and day time.

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2 years ago

In peas, tall plants (T) are completely dominant over short plants (t). You cross two heterozygous pea plants Use a Punnett squa

Nikitich [7]

Answers and Explanation:

Find enclosed the Punnet square.

T= dominant allele

t= recessive allele

Tt= heterozygous genotype

TT and tt= homozygous genotype

- The male pea plant's genotype is Tt (heterozygous)

- The female pea plant's genotype is Tt (heterozygous)

- Male gametes: T and t

- Female gametes: T and t

- The expected genotypic ratio of the offpring will be:

TT: Tt: tt ⇒ 1: 2: 1

1/4 of the offpring will be TT genotype (dominant homozygous), 1/2 of the offpring will be Tt (heterozygous) genotype and 1/4 of the offpring will be tt genotype (recessive homozygous).

- The expected phenotypic ratio of the offpring will be:

tall : short ⇒ 3 : 1

3/4 of the offpring will be tall (TT and Tt) and the restant 1/4 will be short (tt).

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2 years ago

In immediate hypersensitivity, the initial exposure to an allergen usually does not produce any symptoms. the symptoms, such as

stepladder [879]

During the initial exposure to the allergen, contact is made with B cells, these B cells differentiate and produce IgE antibody. The IgE antibodies which works against the allergens are released into the blood stream where they binds to Fc receptors which are located on mast cells and basophils. Now, the mast cells has become sensitized and they will wait patiently for the second exposure. When contact with the allergen is made the second time, the allergen becomes attached to the IgE present on the mast cells and this result in degranulation which trigger a lot of allergic responses.

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2 years ago

Mr. Norris goes on a run around the track, if the track is 400 meters long, and he runs 4 laps, when he stops on his starting po

Mars2501 [29]

Answer:

Explanation:

If the track is 400m and he runs around 4 times, then he runs 1600m. (400x4)

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2 years ago

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What is “selected” for in natural selection?

olasank [31]