What is a concept or principle from the natural sciences that is relevant to John snows work on anesthetics

As , plants meet their needs for making food from air, soil, water, and the sun's energy in a process called there are plants called grow high in trees without here are words to put in the blanks. 1.) producers 2.) consumers 3.) chloroplasts 4.) epiphytes

How does the author's purpose in this passage differ from an author writing about her personal struggle living with asthma?

The pattern of this wave changes between its beginning and end. what is true about the amplitude and wavelength of the wave when the pattern changes?