<span>If the liver cells of an animal have twenty-four chromosomes, the same animal would have twelve chromosomes in its sperm cells. Chromosomes are paired into two types, the X and Y components. The Y components are the sperm cells of an animal.</span>
Answer:
<u>Dichotomous keys help evolutionary biologist because dichotomous keys consist of series of statement which provide choices and act as scientific tool that helps to identify the unknown organisms of different family. These keys are mostly used to identify species of plants and animals based on their characteristics so that these species could be categorized into particular groups.</u>
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Answer:
Two and a half billion years ago, single-celled organisms called cyanobacteria harnessed sunlight to split water molecules, producing energy to power their cells and releasing oxygen into an atmosphere that had previously had none.
Explanation: