Explains the phenomenon of feeling energized, effective, and efficient when your stress level is neither too low nor too high.

Yerkes-Dodson law

Explanation:

The Yerkes-Dodson law states that the there is an increase in the performance with mental or physiological arousal but only up to a certain limit. The psychological and physiological state of being awoken is the arousal. The high level of arousal shows a decline in the performance. This process is represented with a graph that shows bell-shaped curve which increase and decrease with rise in arousal.

This law shows a relation between arousal and performance. The low and high level of stress disrupts the performance level. This law explains the average stress level not too low or too high is important for feeling energized, efficient and effective.

many phylogenetic trees have a single lineage at the base representing a common ancestor. a lineage that evolved early from the root and remains unbranched is called basal taxon. when two lineages stem from the same branch point, they are called sister taxa.

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explanation:

4.) metal

"-the movement of carbon from the nonliving environment into living things and back to the environment

-carbon is the essential component of proteins, fats, and carbohydrates (which make up all organisms)

-carbon exists in air, water, and living organisms

-producers convert carbon dioxide in the atmosphere into carbohydrates during photosynthesis

-bacteria in the atmosphere cycles through the system in filtration units

-in cellular respiration, carbon is released back into the atmosphere as carbon dioxide

-some carbon is stored in limestone (forming one of the largest "carbon sinks" on earth)

-largest carbon reservoir on earth= limestone

-carbon stored in the bodies of organisms as fat, oils, or other molecules may be released into the soil or air when the organism dies

-this may form deposits of coal, oil, or natural gas (fossil fuels, which increased the atmospheric carbon dioxide)

-fossil fuels store carbon left over from bodies of organisms that died millions of years ago

-they are located in the surface of earth, deep within the earth and beneath the ocean floor."