When communities of organisms interact with their physical environment they form a(n)
A. population.
B. organism.
C. community.
D. ecosystem.
E. macromolecular community.
D. ecosystem.
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A three-hectare lake in the American Midwest suddenly has succumbed to an algal bloom. What is the likely cause of eutrophication in freshwater ecosystems, such as this one?
A) increased solar radiation B) introduction of non-native tertiary consumer fish C) nutrient runoff D) accidental introduction of a prolific culture of algae E) iron dust blowing into the lake
A plasmid from the plant pathogenic bacterium ________ ________ is chiefly responsible for the successful genetic engineering of plants.
What will be an ideal response?
Coral reefs: a. remove carbon dioxide from water and air
b. provide compounds used for pharmaceuticals. c. provide protection from storm generated surf conditions. d. all of these choices.
Briefly explain the relationship between the surface area and volume of a cell and overall cell size. List
two ways in which organisms have successfully "solved" this problem.What will be an ideal response?