zoqaeq.blogg.se - The term that crawling cells that move through a sponge delivering food and oxygen

These branches may have separate functions in crustaceans, for instance, the inner branch of a leg is used for walking, while the outer branch may be paddle-shaped or feathery and often functions as a gill. Describes an animal that walks on two legs.īiramous - Arthropod appendages that are biramous have two branches, an outer branch and an inner branch.

turtles.Īnus - End of the digestive tract, or gut, through which waste products of digestion are excreted, as distinct from the mouth.īipedal - adj. A vertebrate distinguished by a skull with no openings in the side behind the eyes, e.g. Most extant mammals give live birth, the egg being retained inside the body during gestation.Īnapsid - n. Any of a group of land-dwelling vertebrates that have an amnion during embryonic development, including reptiles, birds, and mammals. An egg that can be laid on land due to the presence of a fluid-filled amniotic sac ( amnion) that cushions and protects the developing embryo. Songbirds, dogs, and humans are examples of species with altricial young.Īmbulacra - Row of tube feet of an echinoderm.Īmniotic egg - n. Refers to animals with young that are unable to move on their own after hatching or birth, and require extensive parental care.