Estimates suggest that ________ of tropical rain forests have already disappeared.
A) 30 per cent
B) 50 per cent
C) 20 per cent
D) 75 per cent
Correct Answer:
Verified
Q10: Wheat originates from a wild species in
Q11: Standard economic systems tend to _.
A) undervalue
Q12: _ are considered biodiversity "hot spots."
A) Temperate
Q13: Tropical deforestation is caused by _.
A) over-consumption
Q14: The IUCN Red List includes approximately _
Q16: Up to _ of terrestrial species are
Q17: Of the threatened species, _ are threatened
Q18: The Canadian species hunted to extinction as
Q19: Once the most abundant land bird on
Q20: Of the 16 chinook salmon populations studied
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