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biological classification group (taxon) for plants that are divided into classes.
organelles that only occur in the green parts of plants. They contain the green pigment...
a substance found in certain fatty foods or manufactured in the liver. High levels of...
a molecule found inside red blood cells that can carry both oxygen and carbon dioxide.
animals with two cellular body wall layers: the ectoderm and endoderm.
chemicals used as the propellants in aerosol sprays, as coolants in fridges, air conditioners...