What is the difference between a mollusk and an annelid?

Segmented worms vs invertebrates

Explanation:

Mollusks are invertebrates such as snails, scallops, and squids. Different classes of mollusks have different ways of obtaining food. Annelids are segmented worms such as earthworms and leeches. Annelids have a coelom, closed circulatory system, excretory system, and complete digestive system.

the solute can move "downhill," from regions of higher to lower concentration, relying on the specificity of the protein carrier to pass through the membrane. this process is called passive transport or facilitated diffusion, and does not require energy.