The human brain can continue to live without oxygen for (a) about 2 minutes (b) about 6 minutes (c) a few hours

Snakes eat (a) only other animals (b) both other animals and eggs (c) either other animals or fruit

A diamond can be destroyed (a) by either intense heat or acid (b) by both intense heat and acid (c) only by intense heat

In our Solar System (a) neither Pluto nor Neptune are considered to be planets (b) both Pluto and Neptune are considered to be planets (c) only Pluto is not considered to be a planet

Helium gas can be found (a) only in liquid form (b) in neither liquid nor solid form (c) in both liquid and solid form

In a direct current, electrons (a) move in only one direction (b) move in both directions (c) don't move at all

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

Adult giraffes remain standing (a) some of the day (b) all day (c)most of the day

An individual blood cell makes a whole circuit of the body in (a) about 60 seconds (b) about 45 seconds (c) 2 minutes

Of all the water on our planet (a) hardly any of it (b) about half of it (c) most of it ...is found underground