Japan uses an average of 21 quads of energy each year. Calculate the energy used in quads for each source of energy in the pie chart.

primary succession occurs in essentially lifeless areas regions in which the soil is incapable of sustaining life as a result of such factors as lava flows, newly formed sand dunes, or rocks left from a retreating glacier. secondary succession occurs

i think the answer is a.keratin is the pigment responsible for skin color.

it is a. i hope this .