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compounds that consist of any combination of elements, but do not usually contain carbon and hydrogen together.
the second biological classification group (taxon) that is divided into phyla (for animals) or...
a perforated wall or part of a wall at the end of one of the individual cells making up a sieve...
structure in animal cells thought to form the spindle fibres during cell division.
the structure that separates the right ventricle from the pulmonary artery. It prevents the...