Answer:
Free radicals are unstable atoms that can damage cells, causing illness and aging. Free radicals are linked to aging and a host of diseases, but little is known about their role in human health, or how to prevent them from making people sick.
Explanation:
Either b because of the fossil or d because of the fuels?
Hmmm, it could be because we all need oxygen to survive so we need the carbon to be taken out of the air and filtered into more O2
Answer:
By using the subsets.
Explanation:
Evolution is the change in the species characteristics with the changing environment and the passage of the time. Different ideas has been put forward by the scientists to study the evolution.
The organization of the trait groups can be done by using the different subsets. Different sets can be used for example A and B. The set A that is used can be used as the subset of the B group and vice-versa. The traits present in the A set must be present in the B subset as well.
Thus, the answer is by using the subsets.