A) the availability of nutrients 
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Answer:
In grassland ecosystem, first trophic level is the producer. Producers are the organisms which makes their own food, here the producer are grasses. The second trohic level contain herbivores which feed on these grasses. These herbivores are eaten by secondary consumers which belongs to third trophic level and secondary consumers are then eaten by tertiary consumer.
The population of producers are very high so it is placed at the base while tertiary consumer are placed on the top due to low population. 
 
        
             
        
        
        
Answer:
Employee boredom
Explanation:
When an employee specializes in a specific part of job, and it tends to be repetitive each day, it leads to Employee boredom
. Therefore, there should always be novel challenges and tasks in work place which do not make an employee feel boring about same monotonous work each day in which they are already specialized. 
This never intends to mean that Job specialization is a bad thing, but there should be versatility in work because the work of repetitive nature tends to create a sense of boredom in person and makes his mind less creative as he is doing something daily on which he is expert and do not needs more learning.
Hope it helps!