Mass is a measurement of
a. size.
b. weight.
c. distance.
d. an amount of matter

c.it was a major banking and commerce center.

d.leonardo da vinci

d. to fix corruption and problems in the catholic church

d. to reform the catholic church from within

a. human faces are presented in an idealized, spiritual manner.

answer; i believe its called ; checks   and balances;

answer; researchers typically cannot control people's sexual behaviors as would be necessary in an experiment;

no the answer is c only objects touching the earth's surface can be acted upon by an outside force