When is facilitated diffusion necessary? a.) When the molecules are too large.

b.) When the molecules are insoluble.

c.) When the direction of movement is opposite to natural diffusion.

d.) none of the above

Now it's your turn to investigate human impact around the world. grab your virtual lab coat and put on your environmental science hat. you will be taking a trip around the globe to explore three locations. at each location, you will investigate the cause and effect relationships of deforestation, desertification, and urbanization. you will also gather evidence of how these factors have impacted the environment over time

Which is not a type of symmetry? a. asymmetryb. radial symmetryc. bilateral symmetryd. lateral symmetry

Ascientific idea becomes valid when it is what?