Why does WHO warn of an approaching " postantibiotic era"? What is it and how did we possibly get here?

Awave has a wavelength of 15 mm and a frequency of 6 hertz. what is its speed?

How do the sperm cells get from the stigma to the ovules? a. they slide down the petals to the bottom of the flower. b. they travel through pollen tubes. c. they travel along filaments. d. insects carry the sperm cells from the stigma to the ovules.

The climate on the leeward side of a mountain differs from that on the windward side mostly in