M. J. Shleiden shifted the scientific community's attention to cellular processes with his

claim that cells were the basic unit of all plant matter

Explanation:

In 1883, the German botanist Matthias Schleiden came to the conclusion that all plants were built of cells, while the German zoologist Theodor Schwan, only a year later, concluded the same for animals.

Together they lay the foundation of the so-called cellular theory which represents a fundamental discovery in biology. This theory contains three basic postulates:

stratosphere: as the altitude increases, the air temperature increases. the stratosphere has a layer of ozone, called the ozone layer. this layer absorbs most of the ultraviolet radiation from sunlight. this results in the stratosphere being warmer.

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