17. What is the primary function of the cell membrane?
A. It separates the intracellular components from the extracellular space and
allows transport of materials into and out of the cell.
B. It provides rigidity and protects the cell from its environment.
C. It packages and transports proteins and lipids for transport to designated
locations in the cell.
D. It digests foreign materials and unwanted organelles in the cytoplasm.
E. It provides storage space for food or water.

Recent research by marine biologists suggests that bottlenose dolphins have names for themselves. scientists played sounds they had identified as the names of particular dolphins, putting them through a synthesizer so that they did not sound like the voices of particular dolphins. the researchers found that dolphins would respond to the names of other dolphins that they were related to or associated with, but they ignored the names of strangers. this discovery suggests a much greater degree of self-awareness in aquatic mammals than was previously suspected. if this research holds up, what does it suggest about dolphins?

Astudent reads the following text in a science book: scientific evidence tells us that the cause of earths four seasons is the tilt of earth as it revolves around the sound the student is instructed to illustrate this information in a science book. how will the student illustrate winter in the northern hemisphere? a.earths northern hemisphere will tilt away from the sun. b. earths northern hemisphere will tilt toward the sun. c.earths orbit will be farther away than from the sun d. earths southern hemisphere will tilt away from the sun.

Moving down the ramp from 6 meters to