Add spaces: Publichealthisaffectedbyawholerangeofenvironmentalfactors:

Answer: Public health is affected by a whole range of environmental factors:

Add spaces: Itputtorestattemptswhichhadbeenmadeupuntilthistimetofindemissiontheoriesoflightwhichdependedonthevelocityofthesourcebutwerenotinconflictwithexperimentalevidence.

Answer: It put to rest attempts which had been made up until this time to find emission theories of light which depended on the velocity of the source but were not in conflict with experimental evidence.

Add spaces: 15:3Shallwoodbetakenthereoftodoanywork?orwillmentakeapinofittohanganyvesselthereon?

Answer:
15:3 Shall wood be taken thereof to do any work? or will men take a pin of it to hang any vessel thereon?