what do sea anenomes eat ? what do sea slugs eat ?

Sea Anemone, common name for marine, flowerlike polyp having a cylindrical, or vaselike, body. Many species are colored; large specimens may attain a diameter of 1 m (3 ft). The body is closed and attached to rocks or coral at one end and, at the other end, has a central mouth surrounded by tentacles armed with nematocysts (stinging cells and thread cells that paralyze and entangle the small fish and marine animals that constitute its prey). The slitlike mouth opens into a short esophagus opening into the body cavity. At each end of the mouth, a permanent pore opens into a ciliated groove, called a siphonoglyph, in the side of the gullet, through which a continuous current of water flows, carrying oxygen to the tissues and removing waste matter. The body cavity is divided into a number of sacs by septa extending from the body wall. These septa increase the surface available for the secretion of digestive juices and the absorption of nourishment, and they contain the gonads that produce the sperm and eggs.

Most sea anemones reproduce sexually; budding and fission are comparatively rare. The eggs are usually fertilized in the gastric cavity, and the young are discharged from the mouth as free-swimming larvae, which soon attach themselves to surfaces. Hermit crabs sometimes attach sea anemones to their shells (see Symbiosis). Some anemones become completely parasitic on certain species of jellyfish

Sea Slug, common name for a group of shell-less marine gastropods, members of the mollusk phylum. In the adult sea slug, the shell is absent, but it is present during embryonic development. They are also called nudibranchs. They usually live in shallow water and feed on algae, mollusks, and other small marine invertebrates. Sea slugs are often beautifully colored. They breathe either through their skin or by feathery structures called adaptive gills, which are arranged either in rows along their backs or in a circle about the anus when it is located on the dorsal surface. Most species have two pairs of tentacles. Some forms possess no tentacles and are unique in having many eyes on their backs.

There are approximately 1000 species of sea slugs. The plumed, 10-cm (4-in) maned nudibranch is a familiar species on the Atlantic coast of North America, where it glides among seaweeds or swims in water and takes on the color of the anemones on which it preys. On the Pacific coast, the Hopkins’ doris is a bright rose-pink sea slug that inhabits the intertidal zone and eats a pink encrusting bryozoan.

Plankton (smallest plant suspended in sea water)