The molecule that is made during transcription is
A. messenger RNA.
B. ribosomal RNA.
C. DNA.
D. transfer RNA.
Answer: A
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Igneous rocks are overwhelmingly composed of silicate minerals. Why is this so?
A) Silicates are very heavy. B) Silicates compose a huge amount of the earth's crust. C) Silicates are only found in igneous rocks. D) Silicates are very rare.
How do geologists know that the magnetic field of Earth has changed constantly over time?
A) by the direction of historical lava flows, which they have been able to date with radioactive dating methods B) by crystals that have formed in metamorphic rocks C) by records kept in magnetic rock-forming minerals D) by analyzing and extrapolating records kept by scientists since the 1600s
Ultralight aircraft played an important part in the recovery of whooping cranes by
A) spotting potential predators from the sky. B) identifying unknown populations of these birds from the sky. C) leading flocks of these birds on their seasonal migrations. D) distributing vital supplies of food to distant populations during severe winter storms.
How has the Smokey the Bear campaign damaged forest health? What is the importance of fire in ecosystem management? What is the cost of fire suppression for ecosystem health? What is the alternative to fire suppression?
What will be an ideal response?