If you are looking for an introductory textbook on #QuantitativeBiology for undergraduates: I have just uploaded a free book with exercise material that I have written over the last months. It is the first edition, so have mercy.
doi.org/10.5281/zenodo.2127527…
Quantitative Concepts for Biologists
An introductory course on quantitative concepts in biology for undergraduates in biology and natural sciences.Zenodo