Ah, yeah, some amino acids are synthesised in animals. We synthesise a handful of them ourselves. But there are still a bunch that we can't synthesise and need to get from our diet. I think that goes for all animals. Since you need a complete supply of all amino acids to make protein then plants provide the essential link in the chain so you could say it all comes from photosynthesis ultimately.
None that we need and can't get directly from plants.
Ok but I am wondering about the truth of:
> All protein on the planet, was made from sunlight and photosynthesis
Ah, yeah, some amino acids are synthesised in animals. We synthesise a handful of them ourselves. But there are still a bunch that we can't synthesise and need to get from our diet. I think that goes for all animals. Since you need a complete supply of all amino acids to make protein then plants provide the essential link in the chain so you could say it all comes from photosynthesis ultimately.