Which scenario represents a scientific investigation

a. a measurement of growth patterns of crystals in space

b. a selection of favorite songs in a survey

c. a questionnaire on the quality of care in a hospital

d. a survey on the best options for reducing air pollution

I would think it is a. A measurement of growth patterns of crystals in space

That is something that is being tested the other ones are just questions and surveys .

answer: lol

explanation:

lol

the ozone layer acts as a filter for the shorter wavelength and highly hazardous ultraviolet radiation (uvr) from the sun, protecting life on earth from its potentially harmful effects. when the sky is clear, there is an inverse relationship between stratospheric ozone and solar uvr measured at the earth's surface.