The three types of “scientific” research you might come across are blank, blank, and blank

According to the diagram, what sources contribute to the phosphorus found in soil? according to the diagram, phosphorus found in soil contributes phosphorus to what other sources? (site 1)

Of seawater increases with decrease in the temperature. therefore, the cold water sinks to the deeper layers at the bottom

Which of the following was not a major animal on land during the carboniferous period? amphibians insects both a and b none of the above