Answers will vary but should include the noted variety in the sexual world, along with the general increase in population. See pages 192-193. 3. The number of individuals remains the same. These terms are defined in text.
Numerous answers are possible.
The major similarity is that both produce gametes. For specific physical similarities, see pages 196 and 197. Gametes are haploid to preserve the diploid number. The human oocyte rids itself of excess genetic material by forming polar bodies. The excess cytoplasm in the human sperm falls away during maturation.