Explanation

a. Table

b. Parts of alimentary canal of earthworm
    - Mouth;
    - Pharynx;
    - Oesophagus/gullet;
    - Crop;
    - Gizzard
    - Intestine;
    - Anus.    
                                   
c. Ways by which water could be polluted by agricultural practices
    - Farmers add excess fertilizers/organic material to soil which may cause water pollution;
    - The inorganic/artificial fertilizers that contain high concentrations of nitrates and phosphates, dissolves in rain water and washed into nearby streams and rivers;
    - Nitrates and phosphates accelerate the growth of algae/eutrophication;
    - The death/decay of algae in rivers and streams increase the population of bacteria rapidly;
    - And cause oxygen level to decrease drastically;
    - Killing aquatic organisms;
    - Use of chemicals/dynamite for fishing which pollutes water
    - Dumping of cleared vegetation on water bodies;
    - Slash-burn methods of farming which  might wash ash to nearby rivers/water bodies;
    - Pesticides/insecticides also sprayed on crops are usually non-biodegradable;
    - They are washed into nearby rivers/streams/water bodies;
    - Accumulate in the bodies of aquatic organisms;
    - And are passed along the food chain;
    - The concentration of pesticides/insecticides can reach toxic level in the bodies of the final consumers in the higher trophic levels is causing these organisms to die;                                                                         
d. (i) Life cycle of a Housefly
    - The female housefly lays eggs on decomposing matter/rubbish;
    - The eggs hatch into  larvae/maggot;
    - In a few hours;
    - They crawl unto food;
    - Which if solid will be digested by enzymes to liquid;
    - The larvae have twelve segments on the body;
    - The body then contracts;
    - The skin hardens and turns brown to enclose the pupa;
    - After about four days, the pupa changes into the adult/imago;
    - Inside the puparium/brown skin cover;
    - The adult fly then emerges;
    - And flies away.

        OR

e. Diagram of a mature maize seedling

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