Ateacher asked each student in the class to make a model demonstrating the importance of solar energy for life on earth which model should a student make

The model demonstrating the importance of solar energy for life on Earth in which the student should make is a model of a local food web
All food chains begin by receiving the energy of the sun. This energy is captured by plants which are the producer link in the chain. Plants are able to utilize the light energy from the sun to produce food such as sugar from carbon dioxide and water.

The answer is joseph is observing the colour of the reaction mixture to see whether proteins are present in the given solution.