The cell walls of a plant consist mostly of cellulose, a carbohydrate, which provides a strong structure. The cell membrane gets its structure primarily from lipids, and embedded proteins allow for material transport. Which of the following elements would be found in the lowest amounts in both the cell wall and the cell membrane?

during expiration the diaphragm relaxes, which causes the diaphragm to move downwards. the contraction of diaphragm increases the space for expansion of lungs. hence, the diaphragm relaxes and positioned downward during expiration.

answer: c. relative dating

relative dating uses the location and depth of where fossil is found in order to estimate it's age. it gives an idea about the order of past events. it does not give the absolute age but can give approximation. it just gives an indication about one fossil is older than other.