1b)
i)Hooks and suckers allow it to hold on tightly to the wall of the intestine
ii)Its flat body gives it a large surface area to absorb food
iii)It has no need of a mouth or gut as it absorbs already digested food

1ci)
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(1cii)
-Evidences from Palaeontology

2aii)
i) Vector is an organism that does not cause disease itself but which spreads infection by conveying pathogens from one host to another. Species of mosquito, for example, serve as vectors for the deadly disease Malaria
ii) Refuse can be defined as All nonhazardous solid waste from a community that requires collection and transport to a processing or disposal site
iii) Sewage is a type of waste water that is produced from a community of people. It is characterized by volume or rate of flow, physical condition, chemical and toxic constituents, and its bacteriologic status

2b)
i) Mineral salts from soil
ii) Products of photosynthesis from leaves

2c)
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5bi)
i. Natality (birth rate):This refers to the rate of given birth to new organisms. This generally (be it plants or animals) leads to increase in population.
ii. Mortality (death rate):This refers to the rates at which organisms die in a habitat. Mortality generally leads to a decrease in population.
iii. Immigration (dispersal):This is the movement of organisms from different habitats into a new habitat. This tends to increase the population of this new area.
Iv. Emigration: This is the movement of organisms out of a habitat due to either scarcity of food or unfavourable conditions or for breeding purposes. This, however, reduces the population of a habitat.
V. Availability of food: The availability of food in a given habitat tends to increase the population of that habitat through rapid rate of reproduction and other organisms coming into feed.