eating food and digesting it inside the body
an embryonic stage that marks the end of cleavage during animal development; a hollow ball of cells in many species
a three layered structure made out of the endoderm, the mesoderm, and the ectoderm
the outer layer of three embryonic cell layers in a gastrula; forms the skin of the gastrula and gives rise to the epidermis and nervous system in the adult.
the innermost of the three embryonic cell layers in a gastrula; forms the archenteron in the gastrula and gives rise to the innermost linings of the digestive tract and other hollow organs in the adult
the middle layer of three embryonic cell layers in a gastrula; gives rise to muscles, bones, the dermis of the skin, and most other organs in the adult.
immature individual that looks different from an dult
change in body form, from immature larva to sexually mature adult
One class of homeotic genes that provides positional information in animal embryo, which turns into structure- contain homeoboxes
a phylum including the sponges
an arrangement of body parts of an organism like pieces of pie around an imaginary central axis. Any slice passing longitudinally through a radially symmetrical organism's central axis divides it into mirror-image halves.
an arrangement of body parts such that an organism can be divided equally by a single cut passing longitudinally through it. This kind of organism has mirror-image right and left sides.
inner layer of flagellated cells that helps to sweep water through a sponge's body
produce skeletal fibers composed of spongin- wanders through the middle body region
an aquatic animal that sifts small food particles from the water/filter feeder
organism that filters small particles from water to get its food/suspension feeder
a fibrous protein that contains sulfur and composes the fibers of the skeleton of some sponges
needle of silica or calcium carbonate in the skeleton of some sponges
in cnidarians, the jellylike material located between the ectoderm and the endoderm and separates the epithelial cells
a phylum that includes jellyfish and hydras
a body form with a cylindrical body with tentacles projecting from one end; one of the two cnidarian body forms
one of two types of cnidarian body forms; a umbrella-like body form. These kind of cnidarians move freely in water
larva of medusa stage, they are free swimming and eventually settle to the bottom and become a polyp
a digestive compartment with a single opening, the mouth; may function in circulation, body support, waste disposal- food and excrement go through the same hole
cnidarian stinger cells
small capsules that contain a toxin which is injected into prey or predators; esp in jellyfish
a body cavity completely lined with mesoderm
multicellular heterotrophic organisms that obtain nutrients by ingestion