List the strengths and the weaknesses of the model used in this task

In the world of science, models can be described as representations of phenomenons which are present on the Earth or in the universe. A model can be an idea, mathematical calculation, equations, visual representation or computational representation etc.

The strength of a model is that it helps to understand the phenomenons of nature easily. It helps us to understand concepts which otherwise would have been very difficult to understand.

The drawback of a model is that if it is wrong, then people will get the wrong idea of a concept.

If you mess up one of the moon phases then you won't get a arcuate drawing.  

You learn how the moon works and how it reflects off the sun.  

You also can see how the phases differ month to month.

sheep is a herbivore animal whereas grasshopper belongs to the class chordates but both of them feed on greens.  

if grasshopper and sheep feeding on a pasture land, i do not think both of them will have any impact on each other. however, the number of the species can make difference. since sheep feed on greens, there is a possibility there left no pasture land for the grasshoppers or they may get extinct.