1) In "direct current" the electrons a) move in only one direction b) move in both directions c) don't move at all 2) Helium gas can be found... a) only in liquid form b) in neither liquid nor solid form c) in both liquid and solid form 3) Adult giraffes remain standing... a) some of the day b) all day c) most of the day 4) Of all the water on our planet,... is found underground. a) hardly any of it b) about half of it c) most of it 5) Snakes eat... a) only other animals. b) either other animals or eggs. c) either other animals or fruit. 6) A diamond can be destroyed... a) by either intense heat or acid b) by both intense heat and acid c) only by intense heat 7) The human brain can continue to live without oxygen for... a) nearly two minutes b) nearly six minutes c) a few hours 8) In our solar system,... a) neither Pluto nor Neptune are now considered to be planets b) both Pluto and Neptune are considered to be planets. c) Pluto is no longer considered to be a planet. 9) When we breathe out,... a) most of that air is oxygen b) none of that air is oxygen c) some of that air is oxygen 10) An individual blood cell makes a whole circuit of the body in... a) nearly 60 seconds b) nearly 45 seconds c) a few minutes

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