Concept:Organic evolution describes how living organisms change over time through accumulated adaptive modifications from earlier forms, producing new species and biological diversity.
Explanation:Adaptive changes do not occur suddenly in one generation.
They accumulate gradually over a very long period.
These changes arise from pre-existing or older forms of organisms.
The modifications affect body forms, internal structures, and functions.
As different populations adapt to different conditions, diversity increases among organisms.
This entire process of gradual change and diversification in living things is called organic evolution.
It is different from inorganic evolution, which would involve non-living matter.
Therefore, the correct choice is the term that specifically refers to biological change and diversification.
Answer:D. Organic Evolution