1. Classification of Living Things
... that can be determined only by chemical tests. Scientists compare the external shapes and sizes of organisms as well as the anatomy and function of internal organs and organ systems, such as the digestive or reproductive systems. Biochemists study and compare the molecular interactions within an organism that enable it to grow, make and store energy, and reproduce. The early stages of ... . Two of the largest are Plants and Animal. With the invention of the microscope and further studies of life, three more kingdoms have been recognized, Fungi, Protista and Monera. Plant Kingdom The plan...
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