IB Biology Higher Level Syllabus

The biology course is organized by topics.  Both standard level (SL) students and higher level (HL) students study the six core topics.  HL students study these additional five topics, with some of these taking the first six topics to greater depth.  In addition to this, both SL and HL students study one out of a choice of four optional topics. 
Topic 10:   Genetics and Evolution
Topic  11:  Animal Physiology
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"When we try to pick out anything by itself, we find it hitched to everything else in the Universe." 
 John Muir,   1911