Your colleague proposes to test the mechanism of ant navigation by placing a food source 7 m from the nest. she will then pick up the ants from the nest and move them 4 meters from the nest (3 m from the food source). based on the previous data, when do you expect the ants to start searching for their nest on their return trip

immediately

Explanation:

The ants move independently to search food from the nest, but at the same time they go away from the nest, they leave a way of pheromones, this is their mechanisms to return to the nest.

In average, the ants could take like 100 or 200 meters from the nest to search food, so 7 meters is a very small distance, and with the way of pheromones, they will return to their nest easily.

A. Wind.

Explanation:

Energy resources which are sustainable are the ones which would never run out. Wind is something that won't run out because of the windmills in several countries used to generate electricity. Oil, coal and biofuel are limited resources and isn't sustainable at all.