Eukaryotes have a nucleus with a membrane, larger ribosomal subunits, usually reproduce sexually, and may not have a cell wall. Prokaryotes have no membrane around the nucleus, smaller ribosomal subunits, reproduce asexually, and do have cell walls.
b,d,f,e,c,a is the order in which it goes as the scientific method
Darwin's plans to find out about simulated choice by examining pigeons is that he needed to learn whether you can change the entire species taking after that particular pigeon into another type of pigeons. I hope the answer will help you.