Answer:
A. Because new medical findings and improvements in procedures are constantly being introduced.
Explanation:
I majored in Health.
Due to there being no answer choices I can only really give an example.
The non-living parts of an ecosystem are called abiotic factor, so Sunlight, temperature, atmospheric gases, water and soil, Biotic factors are living, so a interaction is with plants, plants require sunlight, soil, water, and CO2 to make food.
