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polysaccharide found in plant cell walls.
an informal term for any living species which appears to be the same as a species otherwise only...
refers to any variation in the nucleotides, genes, chromosomes, or whole genomes of organisms....
when the body makes its own antibodies when deliberately exposed to a dead or weakened pathogen...
the second biological classification group (taxon) that is divided into phyla (for animals) or...
minute pores in the epidermis of a leaf or stem which allows for movement of gases and water...