Whales communicate with other whales by making low-frequency sounds. They
navigate by making high-frequency sounds that echo back to them. Military sonar
systems on ships produce sounds as loud as 200 dB, and these sounds travel
great distances across oceans. Describe how such systems might affect whales.

The carbon cycle is best defined as a process in which a. carbon changes from inorganic forms to organic forms and back b. carbon is changed into other elements such as oxygen or nitrogen c. carbon is continually created from the sun’s energy by plants d. carbon is consumed and regenerated from other elements such as oxygen and nitrogen