Final answer:
Male-male competition in sexual selection involves conflicts between males for mates, while female choice occurs when females select mates based on specific traits.
Step-by-step explanation:
Sexual selection occurs through male-male competition and female choice. Male-male competition involves conflicts between males for mates, while female choice occurs when females select mates based on specific traits.
An example of male-male competition is when male rams butt heads to establish dominance and determine mating opportunities.
An example of female choice is when female peacocks choose to mate with males with the brightest and most elaborate tail feathers.