(30 points) {Brainliest} help me plz <3 An experimental pharmaceutical is typically approved after it passes which phase of clinical trials?

A. 4
B. 2
C. 3
D. 1

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.

answer'(basidium)the spore--bearing structure of a basidiomycete is called a basidiocarp; ///