Which best describes the work the student is doing?
She is following an experiment in a digital library.
She is speaking with a doctor in a digital telehealth call.
She is speaking with other students in a digital
classroom.
She is making observations in a digital laboratory.

The answer is 4 i don't know if its right let me see.

The main types of electromagnetic radiation. radio  waves have  the lowest frequencies  and  longest  wavelengths, while gamma  waves have highest frequencies  and shortest wavelengths. the wavelengths vary across the electromagnetic spectrum from about 10–15 m to more than 104 m.hope it !

The correct answer is:   [a]:   the "stratosphere" .