12. The word aficionados in this passage means A officials.
B devotees.
Cwriters.
D contractors.
Physical Science - Chapter 6 - Page

It's here

Explanation:

a person with a strong and habitual liking for something

answer: the primary difference between a hypothesis and a theory is that b hypothesis is falsifiable, but a theory has been proven to be correct. theory is an explanation of something that is happening but hypothesis is a guess of something that can happen

explanation:

the density(ratio between mass and volume as m/v) decreases from top to bottom in periodic table group as the size increases and nuclear charge decreases. but in periods density increases from left to right as atom size decreases and nuclear charge increases.