Your understanding of macro evolution is seriously flawed. Macro evolution is just a long series of micro evolution. That's ALL it is. There is nothing special or different about it.
The problem is you are not smart enough (no one is - except perhaps god) to understand all the intervening steps.
You don't 'give up' teeth, you get a mutation and are stuck with it. They are not making conscious decisions to evolve, that is just plain ignorance. If you can find a way to survive without the teeth, you continue on. Eventually you get another mutation, and maybe it evolves to take the place of something you lost.
Birds found a way to survive without teeth before they gained a beak. Possibly it was those rocks some birds swallow and use to grind up large chunks of food (I don't know when or if all do this).
Maybe teeth became a liability. People used to die from a rotten tooth, maybe there was an epidemic of bird tooth infecting microbes. It doesn't matter.
As for gender based on-single cell organism, you have that wrong also. Sex evolved from eating - the victim's genes survived inside the single cell that tried to eat it, and it's grew from there. At that point all those single celled life forms were hermaphrodite - they could eat or be eaten and their DNA would survive in the eater. Eventually, the hermaphroditic single celled life forms developed into two varieties - one that could eat and absorb the DNA (female) and the other that could be eaten and pass on their DNA (male).
Also there was no clear line between single celled life forms and multicelluar life forms. First came colonies that learned to cooperate but could also survive on their own.