Put the steps of our solar system's formation in the order scientists think they happened.

The most effective way to provide children with safety messages is to

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?

Lumps of iron and manganese ore called can be harvested from the seafloor near underwater volcanoes.