What is the difference between a Group/Family and a period on the Periodic Table?

Three cards with holes are arranged in a straight line. a light is shined through the first card’s hole and travels through all three cards. what does this tell you about light rays? a) that light is reflected b) that light is refractive c) that light travels in a straight line d) that light does not travel in a straight line

The excretory system,need answers for all: )

In what environment would mineral formation caused by high pressures and high temperatures most likely occur?