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23. The muscles are part of the ____________ system.

a)  digestive

b)  nervous

c)  respiratory

d)  locomotive

24.  What process is described in the following equation?

C₆H₁₂O₆ + 6O₂ à 6CO₂ + 6H₂O

a) Photosynthesis

b) Neutralization

c) Synthesis

d) Cellular respiration

25.  What special molecule is the “blueprint of life”?

a) RNA

b) Protein

c) DNA

d) Lipids

26.  Object A cools off slower than object B after heating.  Object A has a(n) _______________.

a) lower heat capacity than object B.

b) identical heat capacity to object B.

c) higher heat capacity than object B.

d) lower dew point than object B.

27.  Which one of the following represents the set of environmental conditions encountered from day to day?

 a) Climate

 b) Weather

 c) Temperature

 d) Currents

28.  What is the ultimate source of energy for planet Earth?

a) Petroleum

b) The Sun

c) Water

d) Humans