Air must pass from the back to the front of the pharynx to enter the trachea and food must pass from the front to the back of the esophagus
<span>The mirror is used to focus light through the opening in the in the stage of the microscope.</span>
Answer AND Explanation:
Darwin describes natural selection as a process whereby nature selects those organisms that have favourable characteristics to be parents of the next generation. The individuals possessing the favourable traits are better suited to the prevailing environmental conditions. This enables them to stand a better chance to survive in the struggle for existence due to limited resources.
