A survey is conducted among school students. 50 students are randomly selected and they are asked, whether they prefer dogs, cats or other pets. In the survey, 10 boys preferred dogs, 9 boys preferred cats, 3 boys preferred other pets, 12 girls preferred dogs, 6 girls preferred cats and 10 girls preferred other pets. Construct a two-way frequency table for the above data.​

well, that's easy; the answer's c, "it reduces contamination of the water and substrate of the estuary."

the "dirty dozen" chemicals banned in an international treaty are formally known as persistent organic pollutants, or pops. the united nations environment program provided this background on what they are and what they can do to humans and wildlife.

i hope this

the atmospheric gas that forms a mild acid when dissolved in water is called carbon dioxide. the correct answer is a. 2.) chemical weathering would cause an inscription on a marble headstone to become harder and harder to read over time.