muscle that separates thorax from the abdomen; aids in breathing

animal with a backbone

internal skeleton in vertebrates; usually made of cartilage and bone

Able to maintain a constant body temperature by internal means

Not able to maintain a constant body temperature by internal means

part of the nervous system that includes the brain and spinal cord

blood that does not have much or any oxygen is:

period of slowed life processes that allows some animals to survive hot, dry weather conditions

reproductive behavior of fish

flexible supporting tissue that makes up part or all of some animal's skeletons

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