Which of the following answer choices best explains a mechanism as to how Down syndrome might occur?
Choose 1 answer.
Homologous chromosomes fail to separate at chromosome 21 during anaphase II in a parent's
gamete.
Sister chromatids fail to separate at chromosome 21 during anaphase II in a parent's gamete.
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Crossing over doesn't occur during prophase I in a parent's gamete.
Sister chromatids fail to separate at chromosome 21 during anaphase I in a parent's gamete.

when atoms of different types of elements join together, they make molecules called compounds. water consists of compound molecules made up of 2 hydrogen atoms and 1 oxygen atom. this is why it's called h2o. water will always have 2 times the number of hydrogen atoms as oxygen atoms.

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answer: zinc is the substance which has a volume of 1.38 .

density is defined as the mass of an object per unit volume.

it can be calculated by dividing mass of a substance by its volume i.e.

si unit of density is kg per cubic meter and cgs unit of the same is gram per cubic centimeter.

now from the given data volume can be calculated by the formula .

hence, the volume of aluminium will be = which comes out to be 1.703 .

similarly, volume of zinc, chromium, and nickel will be 1.378 , 0.869 , and 0.356 respectively.