The attraction between the Earth and the moon is on the side of the Earth that happens to be the moon, simply because it is . This attraction causes the water on this “” of Earth to be pulled the moon.

Molecules like glucose and amino acids are not lipid soluble, so cannot cross the cell membrane by simple diffusion. instead, they are shuttled across by carrier proteins in the membrane from high to low concentration. does this process require energy from the cell? this is an example of what type of molecular movement?