Answer:
Initial extension ( elongation)
Explanation:
in PCR cycle , there is a third step called as extension (also called as elongation step) which is performed at 72 ° C. In this step taq polymerase will add nucleotides to the primers attached for the extension of template Strand.
Answer: The correct answer is- A. Chromosome numbers vary widely.
Chromosome can be described as thread like structure that is composed of DNA ( deoxyribonucleic acid) and possesses genes ( segment of DNA coding for a particular protein) on it.
Eukaryotic cells ( such as plant cell, animal cell) have variable number of chromosomes.
For instance, human beings have 23 pairs of chromosomes whereas it is different in plants depending on the species.
Thus, A) is the right answer.
Answer:
Lichens are often the first organism to colonize a new surface such as bare rock.
Many organisms require soil before they can colonize an area. Lichens that colonize bare rock secrete acids that break down the rock and start the soil-production process. Also, as lichens die, they provide some organic matter that also contributes to soil.
* Hopefully this helps:) Mark me the brainliest:)!!
Answer:
A barometer
Explanation:
It is commonly used to measure atmospheric pressure
