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Biology Vocab 4-14

Intro to Animals

QuestionAnswer
the series of cell divisions that occur immediately after an egg is fertilized cleavage
an animal that obtains food by eating other organisms or their by products heterotroph
a cavity that is filled with water and that has a support function hydrostatic skeleton
a body cavity that contains the internal organs coelom
a hard, external, supporting structure that develops from the ectoderm exoskeleton
the formation of embryonic germ layers gastrulation
a cavity that serves both digestive and circulatory purposes in some animals gastrovascular cavity
a type of egg that is produced by reptiles, birds, and some mammals that contain a large amount of yolk amniotic egg
an animal whose mouth does not derive from the blastopore deuterostome
the staage of an embryo before gastrulation blastula
the concentration of nerve tissue and sensory organs at the anterior end of an organism cephalization
an internal skeleton made of bone and cartilage endoskeleton
animal that does not have a backbone invertebrate
a stiff rod that develops along the back of an embryo notochord
the embryonic blastopore develops into the mouth protostome
a member of the extinct order of mammal-like reptiles that likely gave rise to mammals therapsid
an animal that has a backbone vertebrate
cells that lack cell walls multicellular heterotroph
a bony skull and an internal skeleton made of bone or cartilage vertebrates
most bilaterally symmetrical animals have an anterior concentration of sensory structures cephalization
end result of cleavage blastula
the blastula begins to collapse inward during... gastrulazation
extinct order of mammal-like reptiles that were dominant on land briefly and that gave rise to mammals therapsid
a rod-shaped supporting axis found in the dorsal part of the embryos of all chordats, including vertebrates notochord
watertight, scale-covered skin and the amniotic egg the major evolutionary innovations that first appeared in reptiles
Created by: la2012
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