Environmental Science
In a pyramid of numbers, in a grassland ecosystem, the largest population is that of

Tertiary Consumers
Secondary consumers
Primary consumers
Producers
Herbivores

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Environmental Science
Infrared and visible satellite images might provide:

A way of determining cloud thickness and altitude.
A way of distinguishing between "new" and "old" clouds.
A way of distinguishing between wet and dry clouds.
A way of identifying clouds suitable for cloud seeding.

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