Given a scientific passage and an answer, generate a question for the given answer.

Passage: Cloud types include cirrus, stratus, and cumulus. Answer: clouds
Cirrus, stratus, and cumulus are types of what?

Passage: Electromagnetic waves vary in their wavelengths, frequencies, and energy levels. The full range of electromagnetic waves makes up the electromagnetic spectrum. Answer: electromagnetic spectrum
What do we call the full range of electromagnetic waves?

Passage: Nonvascular plants include liverworts, hornworts, and mosses. They lack roots, stems, and leaves. Answer: roots, stems, leaves
Nonvascular plants such as liverworts, hornworts, and mosses lack what three typical plant features?