19 The reaction of sodium phosphate and magnesium chloride and is given in the
form of an equation below.
_Na3PO4 + __ MgCl2 --> __NaCl + _ Mg3 (PO4)2
Identify the proper coefficients for the balanced equation that upholds the law of
conservation of mass.
A
B
C
D
2, 3, 6, 1
2, 2, 2, 2
3,1,3,1
1, 2, 2, 1

the answer is true when observing or determining population size, a direct observation is use, in which each organism is counted in a population or in an area. one benefit of this measure is that you get the exact population count but it will take a long time to  determine  the  size  of a  population.

paper covers rock.

explanation:

rock only smashes scissors.