When a system of classification is based on observation of a predetermined set of factors, it is called

i'd say that the moon rock is about 2.2 billion years old.

b. heterotroph

explanation:

he movement of air through earth's or any planet's atmosphere is called wind, and the main cause of earth's winds is uneven heating by the sun. this uneven heating causes changes of atmospheric pressure, and winds blow from regions with high pressure to those with low pressure.

i hope this : )

what in the weirdo : o