Which three investigations will provide evidence to support what they have learned?

measuring how close a soda can must be before it rolls toward a balloon that has been rubbed on someone's hair
counting the number of staples that are directly attached to a strong magnet
dropping a rubber ball from a distance of 1.5 meters above the classroom floor
placing a magnet against a jar containing a mixture of iron filings and sand
measuring how far a toy car travels across the floor before coming to a stop

Tlymphocytes mature in the? a. thyroid gland. b. bone marrow. c. spleen. d. thymus.

Which sentence best describes the relationship between chlorophyll and the chloroplast? a.) chlorophyll is a chemical found in a chloroplast. b.) chloroplast is a chemical found in a chlorophyll. c.) both chlorophyll and chloroplasts are found in animals. d.) both chlorophyll and chloroplasts make carbon dioxide.

Which statement about relative potential energy of electrons is correct? a. an electron in the 2 p orbital of the second electron shell has more potential energy than an electron in the 2 s orbital of the second electron shell. b. an electron in the 2 p orbital of the second electron shell has more potential energy than an electron in the 3 p orbital of the third electron shell. c. an electron in the 3 p orbital of the third electron shell has more potential energy than an electron in the 2 p orbital of the second electron shell.