Apparatus & Techniques: Dissection Dissections are a vital part of scientific research They allow for the internal structures of organs to be examined so that theories can be made about ...
Compromises between Gas Exchange & Water Loss The exchange of gases from the atmosphere is essential for the survival of organisms Oxygen is required for respiration Carbon dioxide is re...
Adaptations of Gas Exchange Surfaces Effective exchange surfaces in organisms have: A large surface area Short diffusion distance Concentration gradient (maintained) Across the Body S...
The Relationship between Surface Area: Volume Ratio & Metabolic Rate The metabolic rate of an organism is the amount of energy expended by that organism within a given period of time The...
近日，各地将陆续开通2022年高考成绩的查询通道，同学们在6月23-26日陆续都可以查到自己的高考分数啦！目前，江西、云南、内蒙古、宁夏、吉林、甘肃等地高考分数线已出炉： 图源：人民网微博 分数出来之后，便是...
Edexcel IGCSE Maths 复习笔记 2.14.1 Quadratic Formula What is a quadratic equation? A quadratic equation looks like (or can/should be made to look like) this:ax2 + bx + c = 0 (as long as a ≠ 0) &nb...
Adaptations In Large Organisms to Facilitate Exchange Single-celled organisms have a high SA:V ratio which allows for the exchange of substances to occur via simple diffusion The large surfa...
Practical Skill: Agar Blocks The effect of changing surface area to volume ratio on diffusion can be investigated by timing the diffusion of ions through cubes of agar of different sizes Met...
Edexcel IGCSE Maths 复习笔记 2.13.1 Linear Simultaneous Equations What are linear simultaneous equations? When there are two unknowns (say x and y) in a problem, we need two equations to be able to...
