The Earth's mantle is the layer of rock just below the Earth's crust. Just under the crust, it is solid. It is very hot, and the other part of the mantle is soft, kind of like melted candy.
The Earth's mantle is rock-hard but it actually flows around the outer core, moving about as slowly as your fingernails grow. The mantle tends to be 2,900 kilometers thick, and makes up 84% of Earth's total volume.
Answer:
Ecosystem A.
Explanation:
I believe that this is the most diverse
Marshes give off saturated soil: "Marshes, also known as wetlands, are frequently inundated (flooded) with water. Plants found in marshes such as the common cattail, lily pads, and duckweed are adapted to the saturated soil conditions. Animals commonly seen in a marsh are otters and muskrats. There are many different types of marshes including coastal, inland, fresh water, salt water, riparian, and more. Marshes get their water from surface water (rain/runoff) and ground water." (Gundersen Envision,p.1)
They have plants and food for living animals there to eat.
There are fish for humans to use as food for.
They Drain common water from floods.
Most have fresh water (Meaning its drinkable)
I think its d) gps technology has led development of robotic tractors for planting,fertilization, and crop harvesting
