What is a meander? select all that apply.

a. a curve in a river
b. a feature formed by erosion
c. a form of underground water
d. a threat to freshwater supplies

and a is not the answer

The first signs of cellular differentiation occur in the blastocyst. why is cellular differentiation important for the development of a fully formed human infant?

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.

Drag each tile to the correct location. match each trait that an organism displays to a reproductive strategy.