D because if the species was to be removed from an ecosystem, everything that needed that species as food, or the species ould have to adapt to the foods available in the new ecosystem they live in. Hope I helped, and let me know if you are still not 100% sure about the answer, and I'll try to clarify what I said.
Answer:
A: Only about 3 percent of Earth’s water is fresh water.
C: About 75 percent of the fresh water on Earth is frozen in ice sheets.
D: The largest source of usable fresh water is groundwater
Explanation:
Catalase enzymes cause hydrogen peroxide to break down, this forms water and oxygen. In other words, it will bubble; the bubbles are oxygen gas.
Nitrogen-fixing bacteria convert nitrogen gas from air into a form that plants can use to make proteins. Free-living nitrogen-fixing bacteria are also found in the soil. When they die the nitrogen they have fixed into their biomass is converted into ammonium .
Answer:
Mid ocean ridge
Explanation:
They are formed under water and there movement is generally up an out. I hope you get it right!