To which external factors do living organisms show responses?

The main difference between living and non-living things is:

Two plants can be conclusively said to belong to the same species if they

In addition to unique characteristics like reproduction,growth,development,response to environment,death,and adaptation,which other characteristic can be added to living organisms?

Match Column-$I$ (Scale) with Column-$II$ (Biological entity) and select the correct option:
| Column-$I$ (Scale) | Column-$II$ (Biological entity) |
| :--- | :--- |
| $(a)$ Macroscopic | $(i)$ Cells |
| $(b)$ Microscopic | (ii) Organisms |
| $(c)$ Sub-microscopic | (iii) Society |
| $(d)$ Conceptual | (iv) Atoms |

The process by which we know which organism is associated with a specific name is called ........ .