A primary air pollutant is directly from the source and secondary pollutants are omitted from two or more different primary pollutants interact with each other in the atmosphere.
EX of primary: carbon monoxide, nitrogen oxide, sulfur oxid
EX of secondary: NO2 acid rain
Answer:
people may get sick or kill their crops by using water thats from unfilter or unsustainable, they're could sometimes be bad chemicals and bacteria in the water
Abnormal cellular growth is caused by DNA mutations that divide in a much higher rate than normal
The daughter cells produced from Meiosis are genetically different from each other due to the process of Crossing Over in the stage of Prophase I.
In Mitosis, there is no Crossing Over involved, since it is intended to help the body in growth and repair, not in reproduction.
Genetic Variation is important for reproduction so that not all offspring look exactly like each other or so that they do not look exactly like their parents.
Answer:
B. Use the polymerase chain reaction (PCR) to make multiple copies of the DNA.
Explanation:
The scientist is to analyze a small sample of DNA, the most useful step to start this would be first the use of polymerase chain reaction to make various copies of that DNA sample. PCR is essential and quick process that gives a lot of copies within few hours. It uses the sample or target DNA, according to which the primers are designed. Taq polymerase and DNA polymerase are also used in the process, it consist of various cycles in which copies are made. There are three basic steps 'Denaturation', 'annealing', and 'extension'.
