Scientists will never know for sure why dinosaurs became extinct. Therefore, scientists should
A) accept the current theory about dinosaur extinction as the best possible theory.
B) continue to learn as much as they can about dinosaur extinction.
C) stop studying dinosaurs and study only living animals.
D) work to raise live dinosaurs to study.
Ans: A) accept the current theory about dinosaur extinction as the best possible theory.
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In humans and other mammals, inactivated X chromosomes:
A. exhibit no gene transcription. B. exhibit a low level of transcription of a few genes. C. exhibit a low level of transcription of many genes. D. exhibit a normal level of transcription of a few genes. E. exhibit a normal level of transcription of many genes.
The main storehouse for substances in sedimentary cycles is ____
a. oceans b. air c. Earth’s crust d. fresh water e. sand
What trematode causes bladder infection, renal failure, seizures and even death
What will be an ideal response?
carbon dioxide fixation occurs in _____ cells
What will be an ideal response?