Phylogenetic Classification Taxonomy is the practice of biological classification The phylogenetic classification system enables us to arrange species into groups based on their evolutionary...
Required Practical: Affecting Microbial Growth When investigating the effect of antimicrobial substances on microbial growth it is essential that aseptic techniques are used Aseptic techniqu...
Adapting to the Environment Environmental factors that affect the chance of survival of an organism are selection pressures For example, there could be high competition for food between lion...
Directional & Stabilising Selection Environmental factors that affect the chance of survival of an organism are selection pressures For example, there could be high competition for food ...
Edexcel IGCSE Maths 复习笔记 4.10.1 Sine & Cosine Rules, Area of a Triangle - Basics What are the sine & cosine rules, & the area of a triangle formula? Remember, Pythagoras and SOHCAHT...
The Theory of Natural Selection Genetic variation exists within populations due to the presence of different alleles There is differential reproductive success between the organisms with dif...
Maths Skill: Using Logarithms When Investigating Bacteria Bacterial colonies can grow at rapid rates when in culture with very large numbers of bacteria produced within hours Dealing with th...
Understanding the Outcomes & Processes in Mitosis & Meiosis Mitosis and meiosis are both forms of cell division They have many similarities and differences that are important for the...
Apparatus & Techniques: Using an Optical Microscope Many biological structures are too small to be seen by the naked eye Optical microscopes are an invaluable tool for scientists as they...
