DNA<span> is a double stranded molecule. The nucleotides on each </span>strand<span> are held to the opposite </span>strand<span> with hydrogen bonds. So if on one </span>strand<span> you adenine the </span>complementary<span> nucleotide is thymine. For guanine the </span>complementary<span> nucleotide is cytosine.</span>
Answer
In any society the number of children produce depend upon the following factors:
1. desire for large families
2. prevalent child mortality
3. knowledge- knowledge on to use family planning, available options, side effects and migration measures, available services and cost.
4. access to quality family planning services
The role of children in society as future providers for family is an important determinant of fertility rate. Africa is still poor under developed and primarily an agrarian/rural society. Mortality rates are also high for children and adults. As a result women tend to produce more child as they know that some of them will die during childhood or adulthood.
<span>The level of carbon dioxide in the atmosphere is maintained by several processes, including photosynthesis, respiration and combustion. Green plants remove carbondioxide from the atmosphere by photosynthesis. Living organisms - including allplants and animals - release energy from their food using respiration.</span>
It is proven to help build healthy muscles, joints, bones etc. It also has a good effect on your academic performance, as it increases the oxygen flow to the brain.