Which of the following is the most common kind of chemical bond in biological molecules

In complete sentences describe the energy flow between the sun, the earth, and space.

Johnny rode his bike to a friend's house 4 blocks down the street in his neighborhood. he immediately rode back home once he realized his friend was not able to play. what was his displacement for the total bike ride? how did you determine this? what could we use as a reference point to determine he was in motion during his bike ride? why can you use it as a reference point

Is dna the same in every cell in the human body explain your answer