How often does your body replace the equivalent of the skeletal system?

1 answer:

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As cells die, and reproduce from time to time, educational references show that every seven years, all cells have been replaced and considered as brand new. This also applies to the skeletal system. However, this statement is still not verified by health researchers.

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I need some help please! Compare and contrast covalent bonds and ionic bonds.

Tanya [424]

Covalent bonds are formed when two atoms are able to share electrons.

Iroinic bonds are form when two atoms are electrons from each other to complete the bond. This results in a pair of ions.

Covalent bonds:

Have a definite shape.
Have a low melting point.
At room temperature they are in a liquid or gas.
They occur between two non-metals.

Ionic bonds:

Have no definite shape.
Have a high melting point.
At room temperature they are solid.
They occur between a metal and a nonmetal.

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How did life begin? are we alone in the universe?

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Answer:

Read the Quran. it tells you how did it begin

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As food moves through the digestive tract it spends the most time in the:

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As food moves through the digestive tract, it spends the most time in the large intestines. This is because of the need to absorb water and partially digest fiber.

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Animals have two major types: _____.

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B. vertebrates and invertebrates.

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In rabbits, black fur (B) is dominant to white fur (b). A purebred black furred male is bred with a female that had the recessiv

ValentinkaMS [17]

Answer:

All the offsprings will be black-furred (Bb)

Explanation:

This question involves a single gene coding for fur length in rabbits. The allele for black fur (B) is dominant to the allele for white fur (b). This means that a rabbit heterozygous for this gene (Bb) will have a black fur.

According to this question, a purebred black furred male (BB) is bred with a female that had the recessive white fur (bb). The parents will produce gametes as follows:

BB - B only

bb - b only

Using these gametes in a punnet square (see attached image), the genotypic proportion of the produced offsprings is as follows:

Bb, Bb, Bb, Bb

All Bb (heterozygous) means that all of the offsprings will be black-furred.

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