The Effect of Genetic Mutations Mutations occur spontaneously and randomly during DNA replication As the DNA base sequence determines the sequence of amino acids that make up a protein, muta...
Required Practical: Investigating Factors Affecting Species Distribution Understanding how to investigate the effects of named environmental factors on the distribution of a given species is an imp...
Conservation & Human Need Humans use many resources from the Earth such as land (for settlements and agriculture), water, wood and fossil fuels As the human population increases and coun...
Apparatus & Techniques: Investigating Growth Rate Using Turbitity Measurements The population growth rate of microorganisms, such as bacteria or yeast, can be investigated by growing the...
Edexcel IGCSE Biology 复习笔记 2.7.5 Human Gas Exchange System Structure of the Breathing System The lungs are the gas exchange surface in humans All gas exchange surfaces have features in common w...
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 ...
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...
Edexcel IGCSE Biology 复习笔记 2.7.4 Practical: The Effect of Light on Gas Exchange in Plants Practical: The Effect of Light on Gas Exchange in Plants Apparatus Boiling tubes Cotton wool Alu...
Edexcel IGCSE Biology 复习笔记 2.7.3 Plants: Gas Exchange in Photosynthesis & Respiration Gas Exchange: Photosynthesis & Respiration The processes of respiration and photosynthesis b...
