Who discovered penicillin and how ?

The hypothesis of continental drift states that earth's continents, which are located on tectonic plates, move relative to each other. which of the following is true of the movement of the tectonic plates? a. tectonic plates only move once every million years. b. they move at a rate of approximately 5 centimeters per year. c. tectonic plates never move, only the continents located on them do. d. their movements are very rapid and occur at random times.

Why does the skin of your finger shrink when you wash clothes for a long time?

Melting glaciers is a serious threat to the environment what is the possible consequence of melting glaciers on polar bears?