Answer:
Index Fossils can be used to identify a specific time period.
Explanation:
<span>An essential functional group involved in cellular energy transfer is the phosphate group.
It is important because it is charged and can release H+ ions into the solution. This makes the group highly acidic, which is important when it comes to the transfer of energy within a cell. Apart from the phosphate group, hydroxyl, carbonyl, amino, and other are also important.</span>
socioeconomic status of individuals
Answer: <u>Capillaries
</u>
Explanation: There are two kinds of vessels which carry the blood throughout the body. These are veins and arteries. Now apart from these two, there is a third type which is called as capillaries, which are the connecting vessels between arteries and veins. These are relatively thinner and allow exchange of gases between tissues and the blood. Therefore, arteries and veins are incorrect options.
Heart is the pumping organ, and its function is to pump the blood to every cell of the body, so this can't be correct option.
