Answer:
Option). It permits hydrogen bonds between DNA strands to dissociate.
Explanation:
PCR (polymerase chain reaction) techniques can bed defined as a technique, which is used for in vitro amplification of sample DNA. It is made up of three steps, denaturation, primer annealing, and extension.
The first step in PCR is heating of sample DNA to denature the double stranded DNA by breaking hydrogen bonding present between bases of double stranded DNA.
Due to this, double strands of DNA get separated and provide templates for synthesis of daughter DNA strands.
Thus, the correct answer is second option.
Https://www.britannica.com/place/North-America/Air-masses
Answer:
Humans rely heavily on pollinator bees to sustain food production globally. But for decades, the insects’ population has declined, in part because of pesticide use. If the die-off continues, it will have huge economic and public health consequences for people. William Brangham reports on groups that are working on innovative ways to save the world’s jeopardized bee population — or supplement it.
Explanation:
Photosynthesis takes within the CO2 produced by all breathing organisms and reintroduces oxygen into the atmosphere. Photosynthesis is that the process employed by plants, algae and certain bacteria to harness energy from sunlight and switch it into energy
