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facing away from the stem (the lower surface of a leaf).
an organism's ability to regulate or maintain its own body temperature.
biological classification group (taxon) for animals that is divided into classes. The plural of...
a prolonged period of low rainfall which has a negative effect on plant, animal and human life...
biological classification group (taxon) for plants that are divided into classes.
the development of a distinct head, with a concentration of nervous tissue and sense receptors...