Answer:
Nucleic acid would be responsible.
Explanation:
B) cell because all living things are made up of cells
Its b. Ecosystem
Population is the number of a species in an area, it has nothing to do with physical characteristics.
Abiotic is just an adjective meaning not alive
Competition is just the interactions between organisms in the struggle for food, water, space, mates, and many other things again not physical characteristics
Answer:
A
Explanation:
Selective breeding takes a person and so does cloning