The earth orbits the sun once per year
Correlation is the measure of the similarity in the trend of two variables or between the pattern of functional change between any two variables. A high correlation indicates that one variable follows the same pattern as the other variable does. However through correlation, one cannot say that the two variables are functionally related to each other. Example, pattern of weather change and change in population of humans. These two are not related but similarities in their pattern of change will wrongly indicate that there's a relation between the two. Similarly between marital satisfaction and sexual frequency, a correlation may mean that one varies like the other. However, marital satisfaction is also strongly depending on economical situation of the subjects, behaviour, complex emotions, etc. And the order of these variables will influence the marital satisfaction. Her findings are not useful in establishing any relationship between the two.
Answer:

Explanation:
This is Xylose-glucose which is an Organic sugar - first isolated from <em>wood</em> ( xylose in greek, which it is named after ), and is a monosaccharide free within the aldehyde group. This is a reducing sugar.
You may know that oxygen, carbon, and hydrogen and base organic elements found in pretty much all organic substances.
The answer is Because they are able to adapt to different conditions.
The least specialized animals are those animals that can survive in a wide range of different environmental factors, unlike specialized animals which are very sensitive to changes. If environment changes suddenly and drastically, highly-specialized animals could not survive because those changes are beyond a range of different factors that affects them. The least specialized animals could adapt to different conditions. For example, one species (specialized) lives in a temperature of 20-25°C. The other species (the least specialized) lives in a range of temperature 5-50°C.
If temperature changes drastically from 22°C to 10°C, the specialized species could not survive and the least specialized would just adapt to those conditions.
If an index fossil whose absolute age is used as a reference for other fossils, it was determined only by radioactive dating or another absolute method.