The Environmental Protection Agency estimates that approximately ________% of rural wells and water systems have some type of pollutant in them
Fill in the blank(s) with correct word
50
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In an example of embryonic induction, signals from cells in the ________ cause gastrulation
a. dorsal lip b. ectoderm c. gray crescent d. endoderm
Which of the following occurs fourth in the eutrophication process?
a. Bacteria use oxygen to decompose plant material. b. Prolific plant and algal growth occurs. c. Nutrients enter the body of water. d. A drop in oxygen occurs that may cause a fish kill. e. Plants and algae die during winter months.
Which of the following is the most effective in
protecting against sexually transmitted diseases? a. condoms b. the Pill c. douching d. an IUD e. the rhythm method
Because of the high pressure and cold temperatures, few species of organisms survive in the deep benthic zone of the ocean
Indicate whether the statement is true or false