Why is a standard system of measurement important?
a. scientists want to share measurement data that they can understand.
b. each country wants its own set of measurement standards.
c. measurements are seldom shared with scientists in different countries.
d. scientists speak many different languages. any ? (: :

a. Scientists want to share measurement data that they can understand.

Explanation:

A standard system of measurement can be define as the units of measurement that is used to measure various dimensions, parameters and other measurable quantities. This helps scientists to quantify the experimental data and can share this data to other scientists which can be understanded by them.

hydrogen is a compound or a single element and a element is a pure substence that cannot be separated into simpler subtances

clorine is a compound its a chemical substance that forms when two or more different elements combine

so both hydrogen and clorine are compounds

the titanic would be the correct answer