Anonlinear, realistic model of the scientific process is called the process of science. the core activity of this process is

A nonlinear, realistic model of the scientific process is called the process of science. the core activity of this process is forming and testing hypotheses.

The process of science involves following skills- communicating, classifying, measuring, inferring, and predicting.

Scientists make progress by using the scientific method. After observing something, a scientist tries to explain what he has seen or observed. This explanation is called an hypothesis.

significant amounts of nitrogen oxides, carbon monoxide, and other pollution

explanation:

passenger vehicles are a major pollution contributor, producing significant amounts of nitrogen oxides, carbon monoxide, and other pollution. in 2013, transportation contributed more than half of the carbon monoxide and nitrogen oxides, and almost a quarter of the hydrocarbons emitted into our air.

≅200-130 milions years ago pangea splited in 2 continents