Which information must be recorded for each sample collected?

Recording field observations and the time of collection is essential because these pieces of information provide context and clarity for the sample collected. Field observations can include visible anomalies, environmental conditions, or specific factors that might affect the sample's characteristics. This context is critical during analysis and helps in interpreting the results accurately.

The time of collection is equally important, as it allows for tracking changes over time, which can be vital when assessing trends or responses to environmental changes. Together, these details can significantly enhance the reliability and relevance of the sample data, making it clearer for subsequent analysis and discussions.

While other information, such as the location of the collection site, weather conditions, and the type of sample collected, are also relevant, the specific combination of field observations and timing provides unique insights into understanding the conditions under which the sample was obtained, offering depth to the data collected.