B: nucleus, mitochondria, cell membrane
c and d both have chloroplasts which are unique to plant cells
a is wrong because only plant cells have cell walls
The notochord is most closely associated with the skeletal.
Answer:
Letter A
Explanation:
From the description you make, it's likely that the structure with letter A is the chloroplast. It is round and small and it's free because of the pigment needed for photosynthesis (chlorophyll). It is located inside the cell, suspended in the cytoplasm.
I believe the appropriate organization found in both cases would be a population. As a population consists of a single species found within a particular area and capable of interbreeding.
Answer:
Option B is correct answer hope it helps