Which of the below examples is the best evidence that species adaptions to rocky shores need to be different than adaptations to sandy beaches? a. paddle crabs can very quickly burrow into the sand using their rear legs while still being able to use their paddles for swimming. b. certain mollusks are able to grind their shells to fit the contours of a nearby rock creating a suction effect. c. mud snails are able to suck in sand and excrete mud that nearby plants grow…and thus able to feed on them. d. marine bristleworms use their fine bristles for swimming and holding themselves in burrows while the tide is in.

Which is not a characteristic of bacteria? a. they are unicellular. b. they are prokaryotic. c. they are the smallest form of life on earth. d. they are multicellular.

Female luna moths (actias luna) attract males by emitting chemical signals that spread through the air. a male hundreds of meters away can detect these molecules and fly toward their source. the sensory organs responsible for this behavior are the comblike antennae visible in the photograph shown here. each filament of an antenna is equipped with thousands of receptor cells that detect the sex attractant. based on what you learned in this chapter, propose a hypothesis to account for the ability of the male moth to detect a specific molecule in the presence of many other molecules in the air. what predictions does your hypothesis make? design an experiment to test one of these predictions.

What is the difference between a meteoroid and a meteor?