Answer the following question based on the given information:

Hydrogen gas is an excellent fuel. It has a high calorific value and produces only water as a product of combustion. It is considered to be a potentially important, non-polluting energy source of the future. 
Hydrogen is labelled with different 'colours' based on the method by which it is produced, as given below:
- green hydrogen: manufacturing process does not produce carbon dioxide. 
- blue hydrogen: The manufacturing process produces carbon dioxide but is separated and stored. 
- grey hydrogen: Manufacturing processes produce carbon dioxide, which is released into the air. 

Hydrogen is labelled' brown' if the manufacturing process releases both carbon dioxide and carbon monoxide into the air. 
In what way is a manufacturing process of brown hydrogen WORSE than that of grey hydrogen for the environment? 

What is the ratio of average amount of energy absorbed by the producers to the average amount of energy absorbed by the primary consumers? 

Answer the following question based on the information given below: 
Shown here is the extent to which two different animals can see in either direction without turning their heads. In animal 1, the eyes are placed towards the front of the head, and animal 2; the eyes are placed on either side of the head. 
Since the placement of eyes in the two animals is different, their vision is also slightly different. 

In the figure above, the grey part represents the part that both eyes can see at a time, while the white part represents those parts that can be seen only by one eye at a time. 
Animal 2 can see a broader area at any time compared to animal 1. Animal 1 can distinguish depth better compared to animal 2. 
Based on this, which of the following two animals is most likely to be a Predator and why?

Answer the following question based on the information given below: 
Shown here is the extent to which two different animals can see in either direction without turning their heads. In animal 1, the eyes are placed towards the front of the head, and animal 2; the eyes are placed on either side of the head. 
Since the placement of eyes in the two animals is different, their vision is also slightly different. 

In the figure above, the grey part represents the part that both eyes can see at a time, while the white part represents those parts that can be seen only by one eye at a time. 
Animal 2 can see a broader area at any time compared to animal 1. Animal 1 can distinguish depth better compared to animal 2. 

Observe the following food web. Classify the animals into two groups - one that would need to have a vision as animal 1 and another as animal 2 in the diagram above:

Arrange the four objects given above according to the time they take to get biodegraded(LEAST time TO MOST time).