Rising Tree said:
None of these are a problem.
Let me go thru a couple to demonstrate.
"Capuchin monkeys lap nectar from flowers in trees as part of their varied diet. In the process they get pollen on their faces and pollinate the flowers."
The ancestors of the capuchins did not have to lap nectar. In fact, I bet that nectar is not their only diet today. Nor do the flowers have the monkeys as their
only pollinators. I'm sure birds and insects also lap the nectar and spread the pollen.
See, here is the capuchin's varied diet
http://www.primatecare.com/adiet.htm
"The Brazil nut is an important source of food for the agouti. The agouti bits open the tough outer shell and eats the nuts inside. Sometimes it buries some of the seeds for later use, and forgets where they all are, so some will have the chance to germinate. Without the gnawing of the agouti, the Brazil nut would be unable to germinate through the extremely hard shell. "
The ancestor of the Brazil tree did not have such thick or hard shells. The seeds could germinate. When the agouti evolved and began eating the nuts, those trees with thicker shelled nuts had the nuts survive and had offspring. But still the nuts could germinate. Now you have an arms race between the agouti and the trees. The agouti getting better at eating thru shells and the trees making thicker shelled nuts. The arms race has progressed to the point that the trees would go extinct because the shells are so thick the nuts can't germinate. But the agouti buries some of the seeds but forgets where they are. There is no mandate that the trees
have to survive. They could go extinct. In which case the agouti eats the nuts of other trees or it also goes extinct.
"Gongora orchids produce no nectar, but they still perform a service for the bees they manage to attract. They produce a strong scent to which the euglossine, or carpenter, bees come. The bees receive no nectar in return for their pollination services, but the scent which they pick up is essential to their own breeding process. The highly scented males gather together and fly in a swarm, which attracts females for mating."
This is co-evolution. First, the orchids attract bees to serve as pollinators. That's good for the orchid. But if the bees don't get food, they become extinct. However, some female bees had the variation that was attracted to the scent of the orchid. Thus, bees getting tricked by the orchid now have an advantage in attracting mates. Originally, this was
not essential. But since they did have an advantage, over many generations the males with the scent got to breed more because they were more sure of attracting a female. Now the scent is "essential" to the bees, but it didn't start out that way.
The remaining items seem to be variations on these evolutionary explanations. if you find one that you don't think the explanation works on, let me know.