how do scientists use a branching tree A. to study the presence of homologous structures in organisms B. to show how groups of organisms might be related C. to study whoch organims have similar stages of development D. to show how groups of organisms become isolated

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Those are different gas lawshere is a brief description of themcharles's law states that volume and temperature are directly proportional to each other as long as pressure is held constant.  boyle's law asserts that pressure and volume are inversely proportional to each other at fixed temperature.gay-lussac's law introduces a direct proportionality between temperature and pressure as long as it is at a constant volume.    source:

The correct answer is:   [a]:   the "stratosphere" .