Answer: DNA replication
The polymerase chain reaction or PCR is a process similar to the DNA
replication but using the machinery of heat-resistant bacteria, resulting in millions of copies of a specific sequence of DNA. That sequence can later be seen through electrophoresis. Both the PCR and the DNA replication of the cell lead to copies of DNA template.
Answer:
Nonpoint-source pollution is the opposite of point-source pollution, with pollutants released in a wide area. As an example, picture a city street during a thunderstorm. As rainwater flows over asphalt, it washes away drops of oil that leaked from car engines, particles of tire rubber, dog waste, and trash. The runoff goes into a storm sewer and ends up in a nearby river. Runoff is a major cause of nonpoint-source pollution. It is a big problem in cities because of all the hard surfaces, including streets and roofs. The amount of pollutants washed from a single city block might be small, but when you add up the miles and miles of pavement in a big city you get a big problem.
In rural areas, runoff can wash sediment from the roads in a logged-over forest tract. It can also carry acid from abandoned mines and flush pesticides and fertilizer from farm fields. All of this pollution is likely to wind up in streams, rivers, and lakes.
Airborne pollutants are major contributors to acid rain. It forms in the atmosphere when sulfur dioxide and nitrogen oxides combine with water. Because acid rain results from the long-range movement of those pollutants from many factories and power plants, it is considered nonpoint-source pollution.
Explanation:
The theory regarding the transition occurring in a population in a country or a region.
Answer:
Physical change means that only the form / shape of the substance is changed , not the chemical properties. So here, cutting of paper is a physical change since it's shape is changed but the chemical properties remain the same.
