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a collection of similar cells that have the same origin.
unicellular organisms that do not have a proper nucleus or membrane bound organelles.
a liquid-filled body cavity formed within the mesoderm of some animals. The cavity occurs...
the site where a nerve impulse is transmitted from one neuron to the next. There is no physical...
a leaf with certain areas that lack chlorophyll. The leaf therefore contains both green and non-...
a thin hairlike outgrowth of an epidermal cell of a plant root that increases the surface area...