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In "direct current" the electrons ...: a. move in only one direction b. move in both directions c. don't move at all
a. move in only one direction
Helium gas can be found ... : a. only in liquid form b. in neither liquid nor solid form c. in both liquid and solid form
c. in both liquid and solid form
Adult giraffes remain standing ... : a. some of the day b. all day c. most of the day
b. all day
Of all the water on our planet, ... is found underground: a. hardly any of it b. about half of it c. most of it
a. hardly any of it
Snakes eat ... : a. only other animals b. either other animals or eggs c. either other animals or fruit
b. either other animals or eggs
A diamond can be destroyed ... : a. by either intense heat or acid b. by both intense heat and acid c. only by intense heat
c. only by intense heat
The human brain can continue to live without oxygen for nearly ...: a. nearly 2 minutes b. nearly 6 minutes c. a few hours
b. nearly 6 minutes
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
c. Pluto is no longer considered to be a planet
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
c. some of that air is oxygen
An individual blood cell makes a whole circuit of the body in ... : a. nearly 60 seconds b. nearly 45 seconds c. a few minutes
a. nearly 60 seconds
