THINKING FOUNDATIONS
Comparison
Compare both things on the same feature. The overlap is what both do. A contrast names both sides of that feature: X does this, and Y does not. Two separate descriptions are not a comparison.
1. Everyday example
Everyday: two routes to school
“The bus is crowded. The bike is red.” Those are two descriptions. A comparison uses one feature for both. “Both take about 20 minutes. The bus does run in heavy rain, and the bike does not.” The contrast says what one does and what the other does not.
2. A level example
A level: glycogen and amylose
Compare and contrast asks for at least one similarity and one difference, about both molecules, and it does not require a verdict. Glycogen is highly branched, and amylose is not: it is a largely unbranched helix. “Glycogen is branched. Amylose is in plants.” never says that amylose does not branch.
A Venn, as an analogy
The overlap is the similarity: both do this. Each side that does not overlap is a contrast. Write it so both things are named on the same feature: X does this, and Y does not.
3. Show me
Show me. A comparison of diffusion and osmosis on shared features.
- Both are passive: neither uses ATP as a direct energy source.
Following the sequence is practice. It is not recorded as mastery.
4. Guide me
Practice question
Guide me. Which sentence is a real comparison?
5. Let me try
Independent transfer. My Progress records this only when the reasoning holds.
Practice question
Let me try. A question says compare arteries and veins. Which plan is sound?