... only under a microscope, and those 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 ... organelles called chloroplasts Parts of the Plants Cells: The many varieties of plant species have distinct cell types that make up individual plants. Similarities do exist among all these cell types; however, these sim...

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