I think all of the above...
because I know they built aqueducts and sewers, so since 2 of they are correct, then all 3 must be.
DDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDD
The are coded in the arrangement of either chromosones or DNA.
Answer:
4. Microorganism
Explanation:
Wind, Salinity, Soil moisture are abiotic factors, non living things.