(choose all that apply)
which factors make it hard for eastern europe to improve the quality of its water?

a. eutrophication
b. carbon credits
c. outdated systems
d. raw water quality
e. unskilled workers

What is the 77 element on the periodtic table

Select the correct answer from each drop-down menu proteins are

Which of the following observation darwin shape his concept of descent with modification? a) species diversity declines farther from the equator. b) fewer species live on islands than on the nearest continents. c) birds live on islands located farther from the mainland than the bird's maximum nonstop flight distance. d) south american temperate plants are more similar to the tropical plants of south america than to the temperate plants of europe. e) earthquakes reshape life by causing mass extinctions.