When something occurs or repeats at regular intervals it is called

Litmus paper is made from water-soluble dyes which are extracted from lichens. this paper is used as an acid-base indicator. which of these common household substances would turn blue litmus paper red? a) bleach b) lye c) soap d) vinegar

This image is an example of a(n) a) atom. b) compound. c) mixture. d) molecule.

What is the standard unit of measure for acceleration?