Which application should a biologist use to record locations of standing water with mosquito larvae in the field?

The most suitable application for a biologist to record locations of standing water with mosquito larvae in the field is Collector for ArcGIS. This application is specifically designed for field data collection, enabling users to gather geospatial information using mobile devices. It allows for easy mapping, capturing of attributes, and real-time data entry, which is essential for biologists who need to mark specific locations quickly and efficiently while on-site.

Collector for ArcGIS supports offline data collection, which is advantageous in remote areas where internet connectivity may be unreliable. The intuitive interface and integration with maps and feature layers make it an ideal tool for this type of environmental monitoring and data recording.

While ArcGIS Online and ArcGIS Pro serve vital purposes in GIS, they are more oriented toward data analysis and visualization, making them less practical for direct fieldwork. Navigator for ArcGIS, on the other hand, is primarily focused on navigation and route optimization rather than data collection. Therefore, Collector for ArcGIS is the optimal choice for the task of recording specific locations of standing water with mosquito larvae in the field.