Peter and Rosemary Grant conducted a 25 year study of the medium ground finch on Daphne Major Island in the Galapagos. They observed and recorded data that clearly showed a shift in the average population beak size to a shorter beak size being more prominent after periods of severe droughts occurring from 1976-1978 and again in
1981-1982. This example of the change in beak depth demonstrates -

Group of answer choices

directional natural selection.

that evolution occurs so slowly that it is not possible to determine if the change has happened in less than a million years.

the environment in the Galapagos Islands has always favored bigger and bigger beaks in the medium ground finch.

disruptive natural selection.

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:

a researcher conducts an experiment on the secretion of a particular hormone in mice. scientists inject mice with a substance that stimulates the production of the hormone. the scientists then test the levels of hormones produced by the mice. the tool used to measure the hormones consistently detects the levels at 10 points lower than the actual hormone levels in the mice. this tool makes measurements, but the measurements aren't .

explanation:

no u

population. population is the number of people or animals in a particular place. an example of population is over eight million people living in new york city.

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