The agricultural practice of irrigation leaves behind which pollutant in the soil? a. salt b. acidic compounds c. pesticides d. nitrogen compounds it's a salt. apex

*will mark brainliest* certain species of are now recognized as indicators of environmental pollution. a. lichen b. mushroom c. yeast d. none of the above

Which term describes the number of waves that pass a given point in a given time? crest frequency trough wavelength

How is the national wildlife refuge system similar to the pacific region coastal program? a. both programs are concerned with providing habitats for wildlife b. both programs are primarily concerned with preserving fish species c. both programs have set aside 150 million acres of land d. both programs are under the u.s. fish and wildlife service