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Define ecology, ecosystem, population, community, species and habitat.
Ecology - the study of relationships between living organisms and between organisms and their environment.
Ecosystem - a community and its abiotic environment
Population - a group of organisms of the same species who live in the same area at the same time
Community - a group of populations living and interacting with each other in an area
Species - a group of organisms which can interbreed and produce fertile offspring
Habitat - the environment in which a a species normally lives or the location of a living organism

Distinguish between autotrophy and heterotopy

Autotrophs - also known as producers, they can make their own food - main producers are photosynthesizers, which utilize the sun's energy and convert it into chemical energy, which they use to build their bodies. Considered net producers of CO2.

Heterotroph - are consumers, they feed on ready made organic material, they cannot synthesize their own food, and they are considered net producers of CO2.

Distinguish between consumers, detritivores and saprotrophs
Consumers- they feed on ready made organic material

Detritovore - organisms that feed by ingesting dead organisms (for example - crabs, earthworms and vultures).

Saprotrophs or decomposers- organisms that feed on dead organisms and products of living organisms. They secrete enzymes on these materials that cause decomposition, and then they absorb the resulting simple compounds into their bodies. So they do not ingest whole food, but rather, they absorb decomposed and digested food. Examples are bacteria and fungi.

Describe what is meant by a food chain giving three examples, each with at least three linkages (four organisms).
A food chain is a linear and simple feeding relation, where one organism has one type of...