The statements that describe steps taking place in the nitrogen cycle are 
- Many biotic and abiotic factors play a role in recycling nitrogen ( A )
- Farming practices and chemicals lead to a build-up of nitrates in the soil ( E )
Nitrogen cycle is biochemical process whereby nitrogen is converted to various chemical forms as it passes through the atmosphere, Marine and terrestrial ecosystems .
Nitrogen cycle undergoes four ( 4 ) important processes which are :  
- Fixation
- Ammonification
- Nitrification and 
- Denitrification
Hence we can conclude that The statements that describe steps taking place in the nitrogen cycle are :
Many biotic and abiotic factors play a role in recycling nitrogen and 
Farming practices and chemicals lead to a build-up of nitrates in the soil 
Learn more about Nitrogen cycle : brainly.com/question/1380063
 
        
             
        
        
        
Survivorship curve = so, first of all, it's a curve, as in a graph. 
It describes "survivorship" - the rate of survival, in other words: out of 100 organisms that are born, how many survive. This rate is different among species, for example, most humans live out to most of their life span, and almost all can survive well beyond a reproductive age. 
However, in frogs for example, many many individuals are born, but only few can survive to adulthood: most die very young, before reproductive age. 
So if you hear about a new species: let's say dogs, and you want to know how long they would live, you would look at their sirvivorship curve (and in some breeds of dogs, those that are likely not to be in shelters, but in homes, the survivorship curve would be similar as in humans: almost all individuals born can live long.  
        
             
        
        
        
Answer:
The reactants are the Products of Photosynthesis which is glucose and oxygen.

Explanation:
 
        
                    
             
        
        
        
Answer:
True
Explanation:
The deep parts of an ocean receive minimal or no sunlight. Hence, the survival of phototropic organisms like plants and algae is impossible or minimal here. Hence, there is a very little diversity in deep oceans. The organisms living here have to feed on dead decaying matter or on each other for survival. Mostly, the organisms living here use dead organisms as food. No other food source is available here.