Why is there less air pressure at higher altitude? A: Air at higher altitudes doesn't have as much air weighing down on it from above.

B: Air at higher altitudes is cooler and less turbulent.

C: The warmer, lighter air rises bringing cooler heaver air to low altitudes.

D: The molecules in the air lose mass and are less effected by gravity, significantly lowering their weight.

Match the types of competition to their descriptions.

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?

Suppose you have monohybrid pea plants in your garden and find that they produce round seed to wrinkled seeds in the ratio of 3: 1. if the allele are designated (r & r) receptively. what is the probable genotypes of the round seeds which produced f 1 ? rr & rr rr only rr & rr rr only rr only