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...
AQA A Level Biology复习笔记7.3.4 Types of Selection
Types of Selection & Their Effects Environmental factors that affect the chance of survival of an organism are referred to as?selection pressures For example, there could be high levels ...
Edexcel IGCSE Biology 复习笔记 2.6.1 Energy
Edexcel IGCSE Biology 复习笔记 2.6.1 Energy ATP Organisms need energy for things such as: Chemical reactions?to build larger molecules from smaller molecules Muscle contraction?to allow move...
AQA A Level Biology复习笔记7.3.3 Selective Advantage
Selective Advantage Every individual within a species population has the?potential to reproduce?and have offspring In reality, however, there are many?environmental factors?that?prevent?ever...
AQA A Level Biology复习笔记7.3.2 Natural Selection
Natural Selection Every individual within a species population has the?potential to reproduce?and have offspring which contribute to population growth If all the offspring of every individua...
Edexcel IGCSE Biology 复习笔记 2.5.12 The Energy Content of Food
Edexcel IGCSE Biology 复习笔记 2.5.12 The Energy Content of Food Practical: Energy Content of a Food Sample We can investigate the energy content of food in a simple calorimetry experiment A...
Edexcel IGCSE Biology 复习笔记 2.5.11 Absorption
Edexcel IGCSE Biology 复习笔记 2.5.11 Absorption Absorption of Food & Water The Stages of Food Breakdown Food taken into the body goes through several?different stages?during its ...
