The first tetrapods (four-legged animals) were amphibians, which evolved from a specialized group of lobed-fin fish. an unusual fossilized animal (named tiktaalik) was recently found; this animal possessed a mixture of fish and amphibian characteristics. what is the term used to describe such an intermediate organism?

Why do leaves change color in the fall? green pigments break down and no longer mask the color of chlorophyll. chlorophyll breaks down and no longer masks the colors of other pigments. red- and yellow-colored pigments grow and mask green-colored chlorophyll. green-colored chlorophyll breaks down and turns red and yellow.

Ture or false evidence for evolution includes millions of fossils

Asquirrel population lives in an area. over many years, a river in that area grows wider and stronger, eventually forming a canyon. the squirrel populations on the two sides of the canyon can no longer mate with each other and ultimately form distinct species. this is an example of