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hard outer supportive skeleton of an animal.
organic compound that always contains the elements carbon, oxygen and hydrogen. The building...
tissue that covers the surfaces of the body (the skin) and lines the ducts of the gut.
refers to any variation in the nucleotides, genes, chromosomes, or whole genomes of organisms....
a kingdom of plant-like unicellular and multicellular organisms that do not contain chlorophyll...
the engulfment of food particles with pseudopodia to form a food vacuole inside the cell. This...