B1.4 Interdependence and adaptation

Organisms are well adapted to survive in their normal environment.
Population size depends on a variety of factors including competition, predation, disease and human influences.
Changes in the environment may affect the distribution and behaviour of organisms.

Candidates should use their skills, knowledge and understanding to:
suggest how organisms are adapted to the conditions in which they live
observe the adaptations, eg body shape, of a range of organisms from different habitats
develop an understanding of the ways in which adaptations enable organisms to survive
suggest the factors for which organisms are competing in a given habitat
evaluate data concerned with the effect of environmental changes on the distribution and behaviour of living organisms.

Environmental change - Changes in the environment affect the distribution of living organisms Examples might include, but are not limited to, the changing distribution of some bird species and the disappearance of pollinating insects, including bees. Environmental effects on animals and plants Such changes may be caused by living or non-living factors such as a change in a competitor, or in the average temperature or rainfall. Using living
Adaptations - To survive and reproduce, organisms require a supply of materials from their surroundings and from the other living organisms there. Competition by plants and animals Plants often compete with each other for light, water, space and nutrients from the soil. Animals often compete with each other for food, mates and territory. Definition of adaptation Organisms, including microorganisms, have features (adaptations) that enable them to