Which of the following is a j-shaped pouch?
a. esophagus
b. gall bladder
c. stomach
d. small intestine?

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

When an object is moving away from you while still making a sound, the pitch of the sound is perceived to a. lower b. unchanged c. fluctuating d.higher

Match each description of an object’s motion with the position-time graph that represents it. not moving moving with constant speed speeding up slowing down