The the loudness of a sound is determined by the or height, of the sound wave. a. frequency b. purity c. amplitude d. pitch select the best answer from the choices provided a b c d

Which organisms have pharyngeal arches that develop from all three germ layers and go through the same development stages as embryos? 1.bird 2.ladybug 3.starfish 4.snake

Hurry which of these is true about index fossils? a) are very scarcely found b) used as guides in relative dating c) found in the youngest layer of the rock d) used as reference points in absolute dating

Name the organs of humanelemintary canal.