A hypothesis is ________
A) a proven scientific fact
B) an instrument that is used to examine environmental conditions
C) a statement that explains an observed phenomenon or answers a question
D) the design of an experiment that can be used in scientific enquiry
E) a prediction about something that has not yet been observed
Answer: C
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Which statement about bird flight is true?
A) Birds must be within a thermal in order to fly. B) Small birds such as sparrows spend most of their time soaring. C) Bird wings are airfoils that cause air to flow faster under the wing than over the wing. D) In order for birds to stay in the air, lift must balance gravity.
Shields are the exposed portions of cratons that contain igneous and metamorphic rocks
a. True b. False
Phytoplankton is responsible for the synthesis of 90% to 96% of the surface ocean's carbohydrates. Indicate whether the statement is true or false
Which of the following countries is NOT in South America?
a. Belize b. Brazil c. Argentina d. Peru e. Chile