Which of the following did not occur during the Cenozoic era?

2 answers:

7 0

The correct answer of the given question above would be option D. The option that did not occur during the Cenozoic era is the formation of the ozone layer. The ozone layer has long been there before any era since it is part of the earth's atmosphere. Hope this answer helps.

Dima020 [189]3 years ago

3 0

Answer: Option d

Explanation: The formation of the ozone layer did not occurred during the Cenozoic era. It took place 2 million years ago. The formation of ozone layer took many years ago that still is present.

The ozone layer acts as a barrier and provides protection against the harmful radiation. The Cenozoic era started about 65 million years ago which proves the formation of ozone layer took long time ago and not during Cenozoic era.

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Explain how a crime lab could use paper chromatography to determine if lipstick found at a crime scene matched the lipstick of a

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The lipstick from the crime would be crushed and dissolved in an appropriate liquid solvent. The lipstick would then be placed in one of the ink spots on the starting / base line of the paper. Another spot would be created for the lipstick with which it is being compared with.

The paper chromatogram would then be placed vertically on a solvent that acts as the mobile phase. After some time, when the solvent reaches the solvent front of the paper chromatography, by capillary action, the chromatogram can be removed and left to dry.

Bands will have appeared on the chromatography paper formed from the different components of the lipstick. The bands of the lipstick from the crime scene and that with which it is being compared to are observed. If the bands are all aligned, horizontally, then this means it is a complete match. The lipstick must have been the same used at the crime scene.

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