The correct answer is - B. feathered.
The primitive mammals were very small (with a couple of exceptions), rodent-like, also very often described as shrew-like. They were feeding with plants, as well as with insects and the occasional egg. Most of them were night creatures, and they were living in the shadow of the much bigger dinosaurs.
So, they were small, furry, rodent-like, night-dwellers, but there isn't a single evidence that any of the primitive mammals, or any mammal whatsoever, had feathers.
B chloroplasts, cell wall since the animals don't have or need them.
They have a certain shape of active sites which only fit in certain substrates
See lock and key theoru
Answer:
A. Natural selection
Explanation:
Only the strongest will survive.