Select the correct answer from each drop-down menu. A is scientific knowledge established through direct observation and remains constant. Scientific knowledge can change when scientists .

The molecules contain like 54 of water 

Idon't know hope someone you

The question is incomplete. complete question is attached belowanswer: correct answer is option b  i.e.  solid particles  reason: filter paper has small pores, through which smaller particles can pass through. however, solid particles  have relatively larger size. hence, they are least likely to pass through.