Don't understand how this was particularly hard; I feel people are just lazy.
The answer is ecosystem.
This is because c refers to a single animal or species. (i.e. population of wolves in said ecosystem.)
Community would be specifically the animals living in an area.
And a landform is the natural feature of a solid surface.
        
             
        
        
        
Circulation of chemical nutrients such as oxygen,carbon,phosphorus,nitrogen,water, and calcium. Through the biological and physical world are known as biogeochemical cycles.
        
             
        
        
        
answer:
c) if, then statement **you chose the correct answer**
explanation:
the hypothesis is an educated guess as to what will happen during your experiment. the hypothesis is often written using the words <u><em>if</em></u> and<em><u> then. </u></em>for example, "if i don't study, then i will fail the test." and since c) is the only answer choice that matches this description, c is the correct answer
good luck :)
i hope this helps
brainliest would be highly appreciated
have a nice day!
 
        
             
        
        
        
Answer:
The area between 200 and 1,000 meters (656 and 3,280 feet) is the mesopelagic or “twilight” zone. 
Explanation:
Light intensity in this zone is severely reduced with increasing depth, so light penetration is minimal. About 20 percent of primary production from the surface falls down to the mesopelagic zone.
 
        
             
        
        
        
Answer
the cycle of processes by which water circulates between the earth's oceans, atmosphere, and land, involving precipitation as rain and snow, drainage in streams and rivers, and return to the atmosphere by evaporation and transpiration.