Demographers developed a hypothesis to explain the changes to the populations of countries over time. This hypothesis describes a demographic transition, in which countries change from a combination of high birthrates and high death rates to low birthrates and low death rates. The changes of the demographic transition are summarized in the graph. Birth rate and death rate are plotted against time. At first (Stage 1) both rates are high. Then in Stage 2, birth rate remains high while death rate decreases. In Stage 3, birth rate decreases to match the low death rate.

Describe the changes that a country undergoes as it passes through the three stages of the demographic transition. Use the United States as an example.

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

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answer: b. nucleolus

explanation: nucleolus is a structure in the nucleus are ribosomes are made.

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the water is warmed up by the sun and then it evaporates into the atmosphere. the sunlight warms the water by its heat. water is then cooled down and condensation takes place. the water then finally returns back to the earth by the process of precipitation in the form of rain or ice.

explanation:

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