When constructing a geologic time scale, how should you divide chunks of time? a) so that all 12 eras have an equal number of years within them b) so that each of the four eons has 1 billion years of time within them c) so that each chunk of time represents a time of similar fossils and geologic events d)so that each chunk of time corresponds to one layer of rock strata

C) so that each chunk of time represents a time of similar fossils and geologic events

Explanation:

It is important to distinguish between the geological timescale and the historical timescale. Geologic time refers to the process of the emergence, formation and transformation of planet Earth. Historical time, in turn, makes reference to the emergence of human civilizations and their capacity for written communication.

To get a rough idea of how human being is a recent episode in Earth's geological time, we use some analogies. For example, if the entire history of the planet were summarized within twenty-four hours of a day, the existence of humanity would have occurred within the last three seconds of that day. So when we talk about a geologically ancient relief formation, we are saying that it formed a few thousand years ago, probably in one of the last geological ages.

this null effect is caused by a weak manipulation and ineffective internal validity. in a scientific study, as the one dr. morimoto is trying to perfom, internal validity refers to the confidence placed in the cause-effect relationship and to how well an experiment is done and able to eliminate confounding variables.        

the arab empire adopted the muslim religion as their main belief. arabs would influence the people from the territories they invaded towards islam (the muslim belief).

nevertheless, throughout the history of the arab empire, rulers brought intellectual individuals from other religions to their centers of learning. these other foreigners included jews, christians, greeks, persians, and indians.   these resulted in the adoption of important knowledge developed by these cultures by the arabic empire. for example, the works of aristotle were translated from greek to arab and indian scientists brought the numerical concept of "zero" to the arabs.

nowadays, 93% of the arab population is muslim, which at the same time is subdivided in sects including the sunni, zaini, alawi, shia. the remaining 7% is composed mainly of christians.