Scientists have been tracking the distribution of genetic variations within an elephant population over a period of 15 years. These variations alone can be used as evidence of(1 point) different reproductive success.

different cognitive abilities.

different stress-related issues.

different environmental factors.

many phylogenetic trees have a single lineage at the base representing a common ancestor. a lineage that evolved early from the root and remains unbranched is called basal taxon. when two lineages stem from the same branch point, they are called sister taxa.

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explanation:

hydrogen is a compound or a single element and a element is a pure substence that cannot be separated into simpler subtances

clorine is a compound its a chemical substance that forms when two or more different elements combine

so both hydrogen and clorine are compounds

the answer u all are looking for is 4000000000000000000000 million years.