Why should you never smell a chemical directly? A. Many chemicals have no smell.
O B. All chemicals smell the same.
C. You cannot learn anything by smelling.
D. Some chemicals can hurt your windpipe.

D

Explanation:

by directly smelling something you are ingesting tiny particles of it, which is why directly smelling a chemical is a bad idea.

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desert perennials often survive by remaining dormant during dry periods of the year, then springing to life when water becomes available. most annual desert plants germinate only after heavy seasonal rain, then complete their reproductive cycle very quickly.