AQA A-Level - Biology 
Organisms exchange substances 
with their environment

AQA | A-Level | Biology | Organisms exchange substances with their environment | Lesson 13

Surface area to volume ratio

AQA | A-Level | Biology | Organisms exchange substances with their environment | Lesson 14

Gas exchange

AQA | A-Level | Biology | Organisms exchange substances with their environment | Lesson 15

Digestion and absorption

AQA | A-Level | Biology | Organisms exchange substances with their environment | Lesson 16

Mass transport