| A | B |
|---|
| filter feeding | Method by which sponges and other animals feed by filtering small particles of food from water as it passes through some part of the organism. |
| hermaphrodite | Animal that has both male and female reproductive organs. |
| external fertilization | Sexual reproduction in which eggs are fertilized OUTSIDE the body of the female. |
| internal fertilization | Sexual reproduction in which eggs are fertilized INSIDE the body of the female. |
| Phylum Porifera | Phylum of pore-bearing animals (sponges). |
| Phylum Cnidarian | Phylum of stinging-celled animals that includes jellyfish, hydra, and corals. |
| nematocyst | Stinging capsules in the tentacles of cnidarians (jellyfish, corals, etc.) |
| gastrovascular cavity | Space inside cnidarian body where digestion and "breathing" takes place. |
| nerve net | Nervous system of cnidarians that conducts nerve impulses from all parts of the organism, but it has no central control (brain). |
| pharynx | Muscular feeding tube extending from the mouth. |
| regeneration | Replacement or re-growth of damaged or missing body parts. |
| scolex | Knob-shaped head of a tapeworm that has hooks and suckers. |
| proglottid | Detachable reproductive section of tapeworms that may contain up to 100,000 eggs. |
| Phylum Platyhelminthes | Phylum that includes flatworms such as planarian and tapeworms. |
