Answer:
C. four single covalent bonds
Explanation:
Carbon atoms can form four single covalent bonds.
"To help foster peace and economic collaboration among European nations" is the one among the following choices given in the question that <span>best describes the purpose of the European Union. The correct option among all the options that are given in the question is the first option or option "A". </span>
A best fit line is a straight line so it can't connect to every dot on the graph. If there were many points everywhere, the line would zigzag to much.
Best fit is meant to be an average of all the dots (data)
It's either C or D
For D, the line does not necessarily miss every one on purpose; a data point could be a part of the average.
The identification of an individual by the means of genetic engineering is possible because the Y chromosomes in the males does not experience any crossing-over as there is only a single Y chromosome present in a human male.
The mitochondrial DNA is passed from the mother to child in the cytoplasm of the cell, and it is passed on without any changes. The X chromosome is can be passed from a mother to her son as he will receive Y chromosome from his father.
Hence, the correct answer is 'Option B - The Y chromosome does not experience crossing over'.
