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chapter 24!!:)

Vocabularies!!:DD

answerquestion
invertebrates animals without backbones.
exoskeletons are hard or tougher outer coverings that provide a framework of support.
endoskeletons are vertebrates, such as sea urchins and sea stars have internal skeleton.
vertebrate is an animal has an endoskeleton and a backbone.
hermaphrodites which produce both eggs and sperm in the same animal body.
zygote is fertilization occurs when the sperm and the egg to form a fertilized egg.
internal fertilization occurs when the sperm and egg combine inside an animal's body.
external fertilization occurs when egg and sperm outside the animals body.
blastula are cells continue to divide, forming a fluid-filled ball of cells.
gastrula is a two-cell-layer sac with an opening at one end.
endoderm is the inner layer of cells in the gastrula.
ectoderm is the outer layer of cells in the gastrula.
mesoderm froms between the endoderm and the ectoderm
symmetry describes the similarity or balance among the body structures of organisms.
radial symmetry can be divided along any plane, through central axis, into roughly
bilateral symmetry means the animal can be divided into mirror image halves only along one plane through the central axis.
anterior head-end
posterior tail end
cephalization the tendency to concentrate nervous tissue and sensory organs at the anterior end of the animal
dorsal are backside
ventral underside or belly
coelom is fluid-filled cavity
pseudocoelom is a fluid-filled body cavity that develops between the mesoderm and the endoderm.
acoelomates are animals that do not have a coelom.
protosomes are the mouth develops from the first opening of the gastrula
deuterostomes are the anus develop from the first opening in the gastrula
filter feeder is when a organism such as sponge its food by filtering small particles from water.
sessile meaning they are attached to and stay in one place
cnidocytes are armed with stinging cells.
nematocyst is a capsule that holds a coiled, threadlike tube containing poison and barbs.
gastrovascular cavity is the inner cell layer of cnidarians surrounds a space.
nerve net that conducts impulses to and form all parts of the body
polyp is a tube-shaped body and a mouth surrounded by tentacles.
medusa is an umbrella shaped body and tentacles that hang down
Created by: elegaspi203
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