Apenny can scratch an unknown mineral. the mineral
-must be talc
-is softer than a diamond
-is harder than a diamond
-has perfect cleavage

What do scientists need to look at before developing an argument

Growth of chest hair, deepening of the voice, and muscle growth are secondary sex characteristics. which most likely affects the development of these traits? testes ovaries prostate gland vulva

If bacteria are much too small to see, what is one reason why can we see colonies in the petri dishes that have plenty of food to eat after only a few days?