Which best explains how and why scientific knowledge is continually expanded and improved?

the scientific process flows in one direction and finds only facts that support a scientist’s original idea.
the scientific process is cyclical so that new facts inspire questions that lead to new studies.
once explanations are found to be true, they do not need to be questioned; then scientists can stop studying the topic.
once facts are found through experiments and observations, other scientists do not need to repeat the experiments.

in chemistry, adhesion and cohesion are attractive forces that exist between molecules. they hold the molecules together from each other. they are different in that adhesive force exists between molecules of different substance while cohesive force happens between molecules of same substance.

adhesion between water and glass causes water molecules at the edge of water and glass interface to climb up the wall in a narrow glass tube. this is called capillary action. cohesion is what gives glass its shape and causes water to form a droplet.