Suppose the environment of a desert ecosystem changes to become much colder and wetter. which organisms in this ecosystem will most likely be affected

All the organisms which will be present in the ecosystem will be affected.

Explanation:

A change in the temperature or weather will affect all the organisms of an ecosystem. The plants of the desert are adapted to live in hot conditions. When it becomes colder and wetter, the plants may not be able to adapt to the changes or they might wilt.

Similarly, the animals in the desert are adapted to survive in hot conditions. They will not have best adaptations to survive in cooler weather and hence, the whole ecosystem will be affected.

the dependant variable is spilled water

the independent is the heat

answer : a model is often used to explain and make things easier to understand when any scientific topic needs to be demonstrated and explained.

as in this case where a scientist wants to use a model to present the results of his detailed scientific investigation. he should do it as it will him to make the audience understand the concept in a much better way. also, it can be changed according to new scientific understandings.