Answer:
it would be C, since an abiotic factor is a non-living thing that helps shape the ecosystem.
Explanation:
If you look at A it lists flowers, which are alive. If you look at B it lists bacteria, which is alive. C doesn't list anything thats alive. D lists insects, which are alive.
The outer skeleton provides protection due to the fact that invertebrates do not have backbones
Chloroplasts are found exclusively in plants, and carry out photosynthesis
