4.3 Classification and Evolution Biological Classification Binomial system – a system that uses the genus name and the species name to avoid confusion when naming organism Classification – the process of placing living things into groups Reasons for classification:...
Communicable Diseases Organisms that cause disease Pathogen – a microorganism that causes disease Transmission of Pathogens Lifecycle of a pathogen: Travel from one host to another (transmission) Entering the hosts tissues Reproducing Leaving the hosts tissues Direct...
Maintaining Biodiversity (a) outline the reasons for the conservation of animal and plant species, with reference to economic, ecological, ethical and aesthetic reasons How are humans reducing biodiversity? Disruption of food chains - over-harvesting Killing to remove...
Biodiversity (b) explain how biodiversity may be considered at different levels; habitat, species and genetic. Habitat - The range of habitats in which different species live. Each habitat will be occupied by a range of organisms. Species - The differences between...
Classification (b)explain the relationship between classification and phylogeny By grouping things into their evolutionary relationships in natural classification phylogeny, which studies the relationship, we can see what organisms are closely related to each other...
Evolution (a) define the term variation Variation is the presence of differences between individuals. This can be within a species or between species. (b) discuss the fact that variation occurs within as well as between species The variation that occurs between...