|an illustration of a food web|
One thing which I have never seen evolutionists address is the evolutionary development of food webs.
Every plant and animal species, no matter how big or small, depends to some extent on another plant or animal species for its survival. It could be bees taking pollen from a flower, deer eating shrub leaves or lions eating the deer.
Photosynthesis is the beginning of the food chain. There are many types of animals that will eat the products of the photosynthesis process. Examples are rabbits eating carrots or worms eating grass. When these animals eat these plant products, food energy and organic compounds are transferred from the plants to the animals.
This would mean seemingly that first the plants evolved, since they need only carbon dioxide, water and minerals. Then herbivores evolved which eat the the plants and finally carnivores evolved which eat the herbivores.
One problem with this theory however is that there is no sign from the fossil evidence that this is so. Entire new ecosystems seem to pop into existence in each geological era. We don't see first grass, then deer and then lions appearing.
Another problem is that even plants are not merely producers in the food web, but they are also consumers. They need animals to produce carbon dioxide which is used for photosynthesis. Animal manure is also a component of topsoil which plants require. Furthermore if herbivores have no predators to reduce their populations they would destroy all plant life. It would seem that an ecosystem coming into existence one piece at time would be an impossibility. This would seem to be a valid example of irreducible complexity.