You are in the lab and notice another student applying cosmetics, why is this dangerous and not allowed in a lab? cosmetics can pick up gases in the lab and those can infect the eyes and mouth. cosmetics contain harmful substances and can contaminate the experiment cosmetics are tested before they are put on the market so they should not harm the person. as long as the student is wearing gloves there is no harm in applying cosmetics in the lab.

Cosmetics can pick up gases in the lab and those can infect the eyes and mouth.

Explanation:

A biology or chemical lab involves the use of chemicals which can be used to conduct the experiment. These chemicals are harmful if inhaled, touch with skin and can burn the cloths.  Thus appropriate measures should be taken to prevent harm.

Cosmetics are products that consists of the chemical substances which are used for the purpose of make up, moisturizing and beautify the skin. The chemicals present in the cosmetics can react with the gases in the experiment, thus may cause burn and injury to the student.

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the oldest known insects are believed to live around 400 millions ago as suggested by the fossil records.   some plants having woody stems also evolved during this time.

after the evolution of insects the first four legged species or the tetrapods evolved in shallow freshwater habitats from the intermediate species approximately 397 million years ago. the tetrapods went on conquering the land giving rise to amphibians, reptiles, mammals and birds.

the major split in tetrapods first occurred 340 million years ago branching off from amphibians.

363 million years ago when the carboniferous period began the insects started roaming on land and taking flights, following which the four limbed tetrapods adapted in the terrestrial habitat.