Step 1: Analyzing Statement II. Propolis is indeed a substance used by bees to seal cracks in the honeycomb, making statement II true.
Step 2: Analyzing Statement III. The assertion about the livestock population and their contribution to farm produce, while surprising, reflects significant disparities in agricultural productivity and is true.
Assertion (A): Animals recapitulate the biochemical aspects of their ancestors.
Reason (R): Mammalian embryo first excretes urea, then uric acid and finally ammonia.
Choose the incorrect combination among the following: