Differences from normal variation on Lake Ontario have been observed in numerous locations from about _____.

The correct choice highlights the geographic coordinates where significant variations from normal observations have been identified on Lake Ontario. The range of 006 W to 007 E aligns with established studies and monitoring data that indicate specific areas experiencing notable changes. This range encapsulates key regions on the lake where differences in water levels, temperature, or ecological indicators have been systematically recorded.

Focusing on the specific coordinates helps in understanding the geographic context of these variations, as they may be linked to factors like local environmental conditions, human activities, or natural phenomena affecting the lake's ecosystem. Hence, choosing this range suggests a targeted and informed approach to assessing the dynamics of Lake Ontario's environment, allowing for focused studies and interventions in those particular areas.