The movement of water molecules in and out of a cell is called osmosis.
Osmosis, or the diffusion of water molecules, is when water molecules flow in or out of a cell from high to low concentrations (down their concentration gradient). The ultimate goal of osmosis is to establish equilibrium between the cell and its outer environment.
The trait that would best indicate that a particular arthropod was a member of subphylum chelicerata is that it possess two body segments instead of three;
A fused head and thorax (cephalothorax), and an abdomen (opisthosoma).
Their segmented body with jointed limbs is covered in a cuticle made of chitin and proteins.
The light-dependent reactions use light energy to make two molecules needed for the next stage of photosynthesis: the energy storage molecule ATP and the reduced electron carrier NADPH. In plants, the light reactions take place in the thylakoid membranes of organelles called chloroplasts.
