AQA A Level Biology复习笔记7.4.6 Succession
Primary Succession Ecosystems are dynamic, meaning that they are constantly changing Sometimes, ecosystems change from being very simple to being relatively complex This process is known as ...
AQA A Level Biology复习笔记7.4.5 Ecosystems
Ecosystems are Dynamic Ecosystems Species do not exist by themselves in their own isolated environment, they interact with other species forming a community The species within a community in...
AQA A Level Biology复习笔记7.4.4 Estimating the Size of a Population
Estimating the Size of a Population Measuring all the different levels of biodiversity within an ecosystem could be very time consuming Finding out which species live in an ecosystem and the...
AQA A Level Biology复习笔记7.4.3 Carrying Capacity
Carrying Capacity The maximum stable population size of a species that an ecosystem can support is known as the carrying capacity Every individual within a species population has the potenti...
AQA A Level Biology复习笔记7.4.2 Abiotic & Biotic Factors
Abiotic & Biotic Conditions Niche The place where a species lives within an ecosystem is its habitat The role that a species plays within its habitat is known as its niche, including: Th...
AQA A Level Biology复习笔记7.3.8 Investigating the Effects of Random Sampling on Allele Frequencies
Practical Skill: Investigating the Effects of Random Sampling on Allele Frequencies Investigations to mimic the effects of random sampling on allele frequencies in a population can be devised using...
AQA A Level Biology复习笔记7.3.7 Types of Speciation
Allopatric & Sympatric Speciation Evolution causes speciation: the formation of new species from pre-existing species over time, as a result of changes to gene pools from generation to g...
AQA A Level Biology复习笔记7.3.6 Reproductive Separation
Reproductive Separation Reproductive separation In order for evolution to occur the new species population must be genetically and reproductively separated from the pre-existing species popu...
AQA A Level Biology复习笔记7.3.5 Evolution
Evolution The allele frequencies (within the gene pool) of a population can change over time due to processes such as natural selection When the allele frequencies of a population change suf...
