The loudness of sound is measured in
A. waves
B. decibels
C. frequency
D. audition

Which of the following structures is not found in both plant and animal cells? a) chloroplast b) cytoskeleton c) ribosomes d) mitochondria

Natural resources are any materials that humans obtain from the earth to meet our wants and needs.

The hypothesis that evolution occurs at an irregular rate through geologic time is known as: directional evolution directional equilibrium punctuated equilibrium punctuated evolution