Mutagens
A. are fatal to humans in low doses.
B. are the primary cause of birth defects.
C. are harmful largely as allergens.
D. cause changes in cell DNA.
E. cannot be passed to future generations.
Answer: D
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By the end of the Permian, small mammal-like reptiles, called ____________________, evolved from the pelycosaur
Fill in the blank(s) with correct word
Fires on the Cuyahoga River raised concerns that contributed to ________
A) the passage of the federal Water Pollution Control Act B) the formation of the U.S. Food and Drug Administration C) a regulatory taking of many of the industries along the river and its tributaries D) the passage of the Clean Water Act of 1972 E) laws requiring the separation of sewage and storm water in cities
Cultural eutrophication cannot be prevented by ____.
A. banning the use of phosphate detergents B. preventing runoff of fertilizer from agricultural fields C. advanced waste treatment D. harvesting excess weeds E. soil conservation and land-use controls
Seismic surface waves travel at about the same speed as ocean waves.
Answer the following statement true (T) or false (F)