I would say,
Aa.
Please mark brainlist.
And sorry for the user below ..☺☻
The Darwin's theory of evolution states that the organisms evolve through the process of the natural selection of the favorable genetic variations gradually over time. Through this process of the evolution, new species are developed over time. A single population may give rise to different species. These newly evolved species share similarities will each other as they have the same ancestor.
Hence, the given statement is 'true'.
Answer:
c. decaying plant and animal remains
I think it can be color flowers because the rest is external, or gills if i am mistaken