The red algae are nonmotile, which means they do not move on their own. Found all over the world in mostly marine but also freshwater habitats, red algae depend upon the movement of the water in which they dwell.Know More
Red algae, also known as rhodophyta, which means "red plant", have from 5,000 to 10,000 species, some of which are seaweeds. They derive their red color from a number of pigments, the most important of which is phycoerythrin. They obtain their energy through photosynthesis. Because the red pigmentation is able to absorb blue light waves, they can survive deeper in the ocean than other forms of algae. Some red algae, called coralline algae, contribute to the formation of coral reef structures by secreting calcium carbonate. Red algae reproduce sexually. Water currents carry male gametes to female sex organs, called carpogonium, where they become attached.
Red algae are consumed not only by fish, crustaceans and other marine animals, but also by humans. They are rich in vitamins and protein and easy to cultivate. The Japanese call them nori and use them to wrap sushi. In Britain they are known as laver and are eaten cold as a salad, baked into bread, fried or mixed with oatmeal. Red algae called Irish Moss are used in puddings, ice cream, preserves, and even beer and wine.Learn More
Corals move about as free-living creatures during their larval phase, only settling down into a semi-stationary lifestyle when they mature. Because the adults are largely immobile, corals have evolved with a number of adaptations to overcome this limitation. Coral moves when it eats, breaths and reproduces.Full Answer >
Starfish move using tube feet on their undersides. Their feet use seawater to form a hydraulic system. The starfish's vascular system is open and relies on the water around it rather than internal pressure. Starfish can only move outside of water for a short time. A starfish left out of water for too long loses its ability to move, and it dies if not quickly returned to the ocean.Full Answer >
Clams that move do so by projecting a “foot,” which is a muscular, fleshy organ that can easily be projected from between the clams' two shells. Physically speaking, however, clams have no legs, arms, mouths or heads.Full Answer >
Crayfish move underwater by fluttering small appendages, called swimmerets; but, they can also use their legs to walk on land or on the floor of various bodies of water. Swimmerets are located underneath the tail and can be used to clutch eggs.Full Answer >