determine which of the following are pure substances, s, and which are mixtures, m.
a. salt water
b. isopropyl alcohol, c3h8o
c. mercury, hg
d. ammonia, nh3
e. an egg yolk
f. honey

Ascientist conducted an experiment and discovered that certain plants grow faster when given a particular amount of fertilizer. anouther scientist conducted the same experiment and got similar results. which concept does this best illustrate? a) repetition b) replication c) precision d) validity