Four friends were talking about how matter and energy move through an ecosystem. this is what they said: will - "i think only energy cycles through an ecosystem." mike - "i think only matter cycles through an ecosystem." dustin - "i think both matter and energy cycle through an ecosystem." lucas - "i think neither matter nor energy cycles through an ecosystem." which friend do you most agree with? explain your thinking.

How can a scientist assess whether a pure niobium (nb) sample is responsible for contaminating the lab with radioactivity? test the niobium sample to see whether it now contains other elements.test the niobium sample for the presence of niobium oxide compounds.heat the niobium, and see if the level of radioactivity in the lab increases.place the niobium under pressure, and see if the level of radioactivity in the lab increases.