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kingdom of multicellular eukaryotic organisms that do not have cell walls, feed heterotrophically and are motile. All higher animals reproduce sexually.
this muscle 'closes' or bends the joint when it contracts (so the angle between the bones...
all the different living organisms on the Earth from the smallest micro-organisms to the largest...
the membrane that surrounds the nucleus. It is similar in structure and function to the cell...
water that is found on the surface of the earth, e.g. in rivers, streams, and lakes etc.