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animals having a bony or cartilaginous skeleton with a segmented spinal column and a large brain enclosed in a skull or cranium.
an animal organism in the early stages of growth and differentiation that in higher forms merge into fetal stages but in lower forms terminate in commencement of larval life.
a part of an organism consisting of an aggregate of cells having a similar structure and function.
a fully differentiated structural and functional unit in an animal that is specialized for some particular function.
an organism that obtains energy and nutrients by feeding on other organisms or their remains.
a period of inactivity that some animals experience in winter that allow them to survive on stored body fat.
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