Motor neurons carrying neural impulses away from the central nervous system and toward muscles to cause
movement. These are called
nerves?

A) efferent
B) afferent
C) All of above
D) None of above

Which member of the following food chain will be least affected by ddt, a pesticide water pollutant, if bio-magnification is occurring? algae> zooplankton> crayfish> leopard frog> large mouth bass

Which organ controls breathing? lungs alveoli heart diaphragm

Satellites orbit earth in the a) mesosphere b) troposphere c) stratosphere d) thermosphere