In the passage, what does visible mean

Hatchell landscape architecture firm worked on which two of the following projects

Respect for the environment means a: loving trees and animals b: not drinking out of streams c: making as little impact as possible on wilderness areas d: only using resources that are high in supply

Meaning to its abbreviation. 1. contraction gr. 2. obsolete as 3. greek pl. 4. anglo-saxon obs. 5. plural g. 6. german ff. 7. that is pron. 8. colloquialism colloq. 9. following i. e. 10. pronoun contr.