Explanation

(a) (i) Ecosystem:
Is a natural unit consisting/made up of living/biotic/organism and non-living/abiotic elements/factors; interacting to produce a stable system.
(ii) Abiotic environment:
The non-living components of the ecosystem; such as light/pH/water/oxygen/wind/temperature etc.

(b) Ecological factors that are specific to:
(i) Aquatic habitat
Salinity; turbidity; tidal movement; dissolved gases; density; substratum; water current.

(ii) Terrestrial habitat
Humidity; soil; topography; wind; altitude; availability of water.
          
(c) The relationship between grass and rabbit in a given habitat

• Grass (green plants) can photosynthesize/ manufacture its food;
• Rabbit which cannot manufacture its food feeds on grass;
• During respiratory process, rabbit gives out carbon dioxide as a waste product;
• Grass makes use of the carbon dioxide to manufacture its food;
• Grass during photosynthesis gives out oxygen as a by-product which the rabbit uses for respiration;

When a rabbit defecates/ dies, bacteria/fungi cause its decay, which forms manure that is absorbed as soil nutrients by grass.

(d) Pyramid of energy

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