Which of these stars is the oldest? a) nearly 100% hydrogen b) nearly 50% hydrogen c) nearly 0% hydrogen d) nearly 0% iron

Hydrogen plays a very significant part in the existence of stars around nebulae. A vast amount of hydrogen is needed for stars to be born. Hydrogen heats up and ignites due to a chain reaction from the collision of atoms but since there is no gravity acting upon the nebulae, it takes millions of years for the stars to exist.

the sphincter muscles at the end of the digestive tract is the anus.

videntify the dna change shown in the diagram and explain how that change can result in the increased genetic diversity often seen among siblings.identify the dna change shown in the diagram and explain how that change can result in the increased genetic diversity often seen among siblings.