Based on close observation of animal development, scientists had assumed that a cell's fate is assigned early in life — and is irreversible. (sciencemag.org)
Attention to detail through close observation of other personnel is required. (careerbuilder.com)
You should be able to determine the quality of the dog's temperament — the single most important thing when choosing a pet, by close observation and interaction with the dog. (komondorclubofamerica.org)