<em>the process by which green plants and some other organisms use sunlight to synthesize nutrients from carbon dioxide and water. Photosynthesis in plants generally involves the green pigment chlorophyll and generates oxygen as a by-product.</em>
Given that a directional hypothesis is a prediction made by a researcher regarding a positive or negative change, relationship, or difference between two variables of a population, a two-tailed test is the perfect tool to validate it because a two-tailed test is designed to examine both sides of a specified data range.
So the final answer to this question is:
True.
Eat while you work. Having a healthy snack while you complete your homework, such as fruits or vegetables, can actually sharpen your focus and improve your memory.
Reward yourself for each task accomplished.
Think of the free time you will have to enjoy once your homework is complete.