: Includes autotrophic and heterotrophic nutrition, energy utilization, and transport systems in both plants and animals.
If you are looking for digital versions, several academic and archival repositories host copies for educational use: Internet Archive: You can find older editions, such as the 1979 Modern Biology or the 1989 edition of Biological Science , available for borrowing or download in PDF format on Internet Archive Academic Repositories: soper a level biology pdf
: This series covers major components including cell biology, biochemistry, physiology, genetics, and ecology. : Includes autotrophic and heterotrophic nutrition