Let's agree on what we HAVE observed, and what we have not. -We have observed:-

• Creatures appearing with no precursors
• Deviation within a species group (different types of apes, monkeys, dogs, cats, cows, melons, etc)
• Deviation within the same breed (morphological/genetic differences between Doberman Pincers, for example)
• Functionally perfect 'adaptations' (i.e. shark's electrical impulse sense)
• Purpose for each 'adaptation'

-We have NOT observed:-

• Speciation - i.e. changing from a goat to a llama
• Life appearing from non-life
• Randomly created NEW features without prior instructions (i.e. no eyes where there was not already the genetic information to create eyes)
• Stepwise change within a species leading to new organs.

-Based on this, the most likely (least convoluted) explanation is:-

• Life was planned/created by an intelligent designer.
• Creatures were created, at a minimum, and the individual species level. (i.e. Apes, Monkeys, Dogs, Cats, etc)
• The plan allowed for variation within that species group. (i.e. Doberman, rotweiller, corgy)