Which of the following is true about a family psychologist?

Which planet do you think would be easiest for humans to colonize some day?

Which statement is the best definition of an atom? a) anything that has mass and occupies space. b) the smallest particle that has the properties of an element. c) a substance that cannot be broken down chemically into simpler substances. eliminate d) the smallest unit of a substance that exhibits all of the properties characteristic of that substance.

Each line (unit) on the horizontal axis represents: 5 years 10 years 20 years all of the above