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animals with three cellular body wall layers: the ectoderm, mesoderm and endoderm.
the process whereby useful molecules, such as glucose and amino acids, as well as water and...
the part of the atmosphere that contains the ozone layer and is about 10 km above the Earth's...
chlorofluorocarbons (CFCs) are organic compounds that contain carbon, chlorine and fluorine.
the introduction of harmful substances (pollutants) into the environment.
vascular tissue that conducts food substances from the leaves to other parts of the plant. The...