Earth is about ________
A) 6,000 years old
B) 4.6 billion years old
C) 4.6 million years old
D) 40 billion years old
E) 400,000 years old
B
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Glacial deposits, as well as striated and polished bedrock, indicate that two major episodes of glaciation took place during the _______________
Fill in the blank(s) with correct word
One example of artificial selection is ________
A) the process of allopatric speciation B) pet dogs that have gone wild, mate with coyotes, and live in packs C) humans placing a gene for human insulin into a flower D) broccoli, cauliflower, cabbage, and brussels sprouts bred from Brassica oleracea E) crossing a lion and a tiger to get a sterile animal called a liger
What environmental features make Yunnan particularly suitable for such plantation crops as tea and coffee?
What will be an ideal response?
The earth receives energy from the Sun by:
A) conduction. B) convection. C) scattering. D) radiation.