____ is the term used to categorize the stage of development that most cells are programmed to. For instance, skin cells will activate the genes required for skin while the muscle cells will activate genes for muscle. There are two types:_____: refers to animals with relatively late differentiation. These could differentiate into two separate organisms (ie. twins) This type has spiral/radial cleavage patterns____: refers to animals with early differentiation. These rarely develop into separate organisms. If a cell does separate, it forms two halves of single organism. This type has spiral/radial cleavage patterns

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