During what time period did dinosaurs exist on Earth?
A. Mesozoic
B. Precambrian
C. Paleozoic
D. Cenozoic
Answer: A
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Even if a country has banned the use of DDT, the pesticide can still enter the country as it can be carried by vectors such as wind.
Answer the following statement true (T) or false (F)
When Nellie is suspended at rest by a pair of gymnastic rings, the upward support forces by the rings will always
A. each be equal to her weight. B. add up to more than her weight. C. each be half her weight. D. add up to equal her weight.
Which of the following features is created at a divergent plate boundary?
A) mountain building at the margin of the continent B) oceanic trench C) subduction zone D) continental crust E) rift valleys
Trilobites are common organisms in aquaria today
Indicate whether the statement is true or false