Which are the basic physical sciences? biology, paleontology, biochemistry and zoology
medicine, biotechnology, genetics and pharmacology
chemistry, physics, astronomy and earth science
Correct.
mathematics, statistics, logic and computer science

Okay so, each element always is abbreviated with a capital letter and a lowercase letter, so each each new elements starts with a capital letter. To answer these problem you have to find the element or compound and whats in the element/compound and count how many you have. Then, it transfers over the arrow to how many of each element you have.

I hope this helps! :)