sentence2_structure: Watering plants and grass in the early morning<>is<>a way to conserve water$$$smaller amounts of water<>evaporate<>in the cool morning
sentence1: Campus workers should also attempt to fulfill their part in water conservation by watering the flowers and grass on campus in the early morning or late night, when water evaporation is minimal.
sentence2: Watering plants and grass in the early morning is a way to conserve water because smaller amounts of water evaporate in the cool morning.
question: Why is watering plants and grass in the early morning a way to conserve water?