| A | B |
|---|
| acoelomate | Animals that have three cell layers with a digestive tract but no body cavities |
| anterior | head end |
| asymmetry | An animal that is irregular is shape has a body plan that exhibits |
| bilateral symmetry | An organism that can be divided down its length into similar left and right halves |
| coelom | A body cavity completely surrounded by mesoderm |
| deuterostome | An animal in which the anus develops from the opening in the gastrula. |
| dorsal | back surface |
| ectoderm | The layer of cells on the outer surface of the gastrula is called |
| endoderm | The layer of cells lining the inner surface is called |
| endoskeleton | A support framework housed within the body |
| exoskeleton | A hard waxy covering on the outside of the body provides support |
| gastrula | A structure that is made up of two cell layers. |
| mesoderm | The third cell layer formed in the developing embryo. |
| posterior | tail end |
| protostome | An animal with a mouth that develops from the opening in the gastrula. |
| pseudocoelom | A fluid-filled body cavity partly lined with mesoderm |
| radial symmetry | Animal that can be divided along any plane through a central axis into roughly equal halves |
| sessile | Animals that don't move from place to place. |
| symmetry | A balance in proportions of an object or organism |
| ventral | belly surface |
| multicellular | Animals are ______ organisms. |
| animals | _____ feed on other organisms. |
| moving | Aminals have ways of _____. |
| animal cells | _____ _______ do not have cell walls. |
| heterotrophic | To obtain energy and nutrients from outside sources. |
| vertebrates | Animals with backbones |
| invertebrates | Animals without backbones |
| internal cavity | Place where disgestion occurs in earthworms frogs and monkeys. |
| individual cells | Place where digestion is carried out in sponges and flatworms |
| functions | Animal cells are adapted to carry out different _____ |
| two | Earthworm's digestive system has ____ openings. |
| zygote | A single fertilized egg cell which most animals develop from |
| cleavage | The process of forming two new cells |
| blastula | a hollow ball of cells |
| blastula | single layer of cells surrounding a fluid-filled space |
| early | The blastula is formed ____ in the development of the embryo |
| ectoderm cells | ____ ____ develop into the skin and nervous tissue of the animal. |
| endoderm cells | ____ ____ develop into the lining of the animal's digestive tract. |
| proto | Greek for before |
| stoma | Greek for mouth |
| deutero | Greek for secondary |
| protostome deuterostome | ___ & ____ differ in the location of the cells that become the organisms mouth |
| meso | _____ means middle |
| calcium | An element that is important in the formation of spines in the sea urchin. |
| protection | The sea urchin has spines that it uses for ____ |
| symmetry | all animals have some kind of _____ |
| irregular shaped | Sponges have an _____ _____ body |
| sessile | Asemmetrical animals are often ____ |
| 600 million | Sponges first evolved ________ years ago |
| sponges | _____ are one of the oldest groups of animals |
| endoderm, mesoderm, gastrula | Sponges' embryonic development does not include formation of ___, ____, ___ |
| radial | Hydra has _____ symmetry |
| radial symmetry | An adaptation in Hydra that enables it to detect can capture prey |
| bilateral | A flatworm has ____ symmetry |
| diffusion | Process through which water adn particles of digested food pass through a solid acoelomate |
| exoskeletons | _____ prevent water loss and provide protection |
