Biologists conservatively estimate that the current extinction rate is ____________________ times the normal background extinction rate
Fill in the blanks with correct word
100
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Describe how the sinkholes appear in the photos.
What will be an ideal response?
The Andes Mountains are associated with an oceanic-continental convergent plate
margin. Indicate whether the statement is true or false.
Once released into the atmosphere, chlorofluorocarbons remain about ____
a. 10-20 days b. 50-100 years c. 1-2 years d. 1-2 month e. 1000 years
One benefit of offshore wind farms is that ________
A) maintenance costs are less than they are on land B) unlike land-based wind farms, they do not interfere with bird migration routes C) wind speeds are higher and turbulence is lower over water than over land D) they are more aesthetically pleasing than wind farms on land E) costs to erect the turbines are lower, and land does not need to be purchased