Which of the following pairs represent homologous structures? 1.Cat paw and a human hand
2.Fish gills and human legs
3.Rabbit ears and deer antlers
4.Giraffe neck and elephant trunk

Dna is colied into chromosomes in a cell

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?

Based on the topographic map of mt. st. helens, what is the contour interval of the volcano about height is 2,950 m?