3. The number of significant figures in an answer to a stoichiometry problem is determined only by
OA
OB
the number of significant figures in the mole ratio used to
solve the problem.
the number of decimal places in the molar masses of
substances in the chemical equation.
the number of significant figures of any measured quantities in
the problem.
the number of significant figures in the molar masses of
substances in the chemical equation.
Oc
OD

plants need sunlight, water, and carbon dioxide to make food. plants use the raw materials of water, nutrients they absorb from soil, and carbon dioxide to make sugars the plant can use. energy from the sun and chlorophyll are also needed.

most historians agree that gabriel mouton, the vicar of st. paul’s church in lyons, france, is the “founding father” of the metric system. he proposed a decimal system of measurement in 1670. mouton based it on the length of one minute of arc of a great circle of the earth (now called a nautical mile, 1852 meters). he also proposed the swing-length of a pendulum with a frequency of one beat per second as the unit of length (about 25 cm). a pendulum beating with this length would have been fairly easy to produce, thus facilitating the widespread distribution of uniform standards. over the years, his work was revised, improved, and extended by a number of french scientists.

the political sponsor of weights and measures reform in the french revolutionary national assembly was the bishop of autun, better known as talleyrand. under his auspices, the french academy appointed several committees to carry out the work of developing a usable system of weights and measures for france. one of the committees recommended a decimalized measurement system based upon a length equal to one ten-millionth of the length of a quadrant of the earth’s meridian (i.e., one ten-millionth of the distance between the equator and the north pole).

50.23 i believe is correct but don't quote me on that.

d) a person who learns about the world by observing it.

explanation:

scientist are people who discover why and how things are done and made in the world.