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5 Cards in this Set
- Front
- Back
Characteristics of Animals |
multi-cellular heterotrophic eukaryotes have tissues that develop from embryonic layers (there are exceptions) |
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Heterotroph |
organism that has to ingest its food |
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Cell structures and specialization in animals |
• Animals are multicellular eukaryotes • Their cells lack cell walls • Their bodies are held together by structural proteins such as collagen • Nervous tissue and muscle tissue are unique,defining characteristics of animals |
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animal reproduction |
Most animals reproduce sexually, with the diploidstage usually dominating the life cycle |
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development
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After a sperm fertilizes an egg, the zygoteundergoes rapid cell division called cleavage • Cleavage leads to formation of a multicellular,hollow blastula • The blastula undergoes gastrulation, forming agastrula with different layers of embryonic tissue |