Which type of scientist studies and analyzes past events in order to explain "what, how, or why something happened"?

Historians are the type of scientists who studies and analyzes past events in order to explain "what, how, or why something happened

Explanation:

History can be described as the study of events which occurred in the past. Historians are the scientists which are interested to study the history of any event which took place on earth. Some historians might be interested in the history of how earth formed, others might be interested in finding out how different countries or sub-continent was formed. Hence, everything related to history is studied by the historians.

answer: - few nutrients

high pressure

low temperatures

explanation: 1. few nutrients:   open-ocean zone is located way far from the land, which is the main source of the essential nutrients.2. high pressure: pressure increases by 1 atmosphere for every 10 meters increase in depth.3. ample sunlight: a large fraction of the sunlight is reflected back to the atmosphere from the sea surface. 4. varying salinity: below the thermocline, the water is isolated from the atmosphere so the salinity remains stable over the year.5. low temperatures:   the temperature of open-ocean zone ranges from a low of -2°c to an average of 17°c

within 30 of the equator hope this