Which of these would be a normal resting heart rate of an adult?
A. 84 beats per minute
B. 50 beats per minute
C. 118 beats per minute
D. 42 beats per minute
Which of these best defines the term "biosphere"?
A. the part of Earth where life occurs on land
B. the part of Earth where life occurs on land and in the water
C. the part of Earth where life occurs, which includes land, water, and air
D. a collection of populations in a habitat
According to the electromagnetic spectrum, which is the highest frequency (shortest wavelength) wave known to exist?
A. gamma rays
B. infrared waves
C. ultraviolet light waves
D. radio waves
Which of the following is a positively charged subatomic particle?
A. Electron
B. Proton
C. Neutron
D. Nucleus
The glucose content of the blood is regulated by __________.
A. insulin and adrenaline
B. nerve stimulation
C. ACTH
D. progesterone
The mass of 1 cubic meter of water is approximately __________.
A. 1 kilogram
B. 10 kilograms
C. 100 kilograms
D. 1,000 kilograms
The member of the solar system with the shortest period of solar revolution is a __________.
A. planetary satellite
B. asteroid
C. planet
D. comet
Which planet in the solar system has the most moons?
A. Neptune
B. Venus
C. Saturn
D. Uranus
What element is the most abundant one in the atmosphere?
A. oxygen
B. nitrogen
C. helium
D. hydrogen