A student thinks that populations higher in a food chain are larger because they deplete the populations of
organisms lower in the chain. Using evidence from this
lesson, explain why this student's thinking is incorrect.

If scientists are wrong about earth's age based on radioactive material and the decay rates are really much faster, how would nuclear power plants be affected?

Describe the response the kidneys have to dehydration and excessive water intake. what happens to the concentration of urine in each case ?

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?