I don't understand the differences between 'differential' and 'different' as adjectives in the quotations below. English isn't my first language. Why do these books use 'differential (https://www.lexico.com/definition/differential)' as an adjective? Why not just write 'different'?1. Handbook of the Biology of Aging edited by Edward J. Masoro, Steven N. Austad. p 480 (https://books.google.com/books?id=AuwaFTRdNHsC&pg=PA470&dq=biology+%22differential%22+-equation+-equations&hl=en&sa=X&ved=0ahUKEwjcwcPtoPPmAhVHXM0KHTaWBcAQ6AEIkAEwDg#v=onepage&q&f=false).
(https://i.stack.imgur.com/NBvFk.jpg)
2. The Cambridge Companion to the Philosophy of Biology edited by David L. Hull, Michael Ruse. p 46 (https://books.google.com/books?id=aZOgg-x4UyIC&lpg=PP1&dq=The%20Philosophy%20of%20Biology%20hull&pg=PA46#v=onepage&q&f=false).
(https://i.stack.imgur.com/rSuzJ.jpg)
3. p 78 (https://books.google.com/books?id=aZOgg-x4UyIC&lpg=PP1&dq=The%20Philosophy%20of%20Biology%20hull&pg=PA78#v=onepage&q&f=false).
(https://i.stack.imgur.com/8s8Rn.jpg)
4. Dictionary of Plant Genetics and Molecular Biology by Gurbachan Miglani. Anyone know the page # (https://books.google.com/books?id=7IZHDwAAQBAJ&pg=PT67&dq=biology+%22differential%22+-equation+-equations&hl=en&sa=X&ved=0ahUKEwjcwcPtoPPmAhVHXM0KHTaWBcAQ6AEIbDAJ#v=onepage&q&f=false)?
(https://i.stack.imgur.com/8s8Rn.jpg)