Mountains and bodies of water.
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The two horizontal divisions of marine ecosystems are the pelagic zone, which includes the open water column, and the benthic zone, which includes the ocean floor. These zones are distinct in terms of the organisms that inhabit them, the environmental conditions they experience, and the ecological processes that occur within them.
According to Ernest Rutherford, physics and stamp collecting, though that's a bit pejorative. One common division is between physical sciences (physics, chemistry, geology, astronomy) and life sciences (biology, medicine, pharmacology).
The two divisions of the central nervous system (CNS) are the brain and the spinal cord. The brain is responsible for processing and interpreting sensory information as well as controlling body functions, while the spinal cord mainly serves as a pathway for transmitting signals between the brain and the rest of the body.
The two processes that sustain ecosystems and the biosphere are photosynthesis and nutrient cycling. Photosynthesis is the process by which plants convert sunlight into energy, while nutrient cycling involves the cycling of essential nutrients like carbon, nitrogen, and phosphorus through the ecosystem. These processes are linked because photosynthesis produces oxygen and glucose that support the biogeochemical cycles involved in nutrient cycling, ensuring the continuous flow of energy and nutrients through ecosystems.
The two major divisions of natural science are physical science, which focuses on non-living systems like matter and energy, and biological science, which studies living organisms and their interactions with each other and their environment.