Intrator (2003) stated that good teachers live for those moments when the students are .

“On fire”

Explanation:

Intrator (2003) stated that good teachers live for those moments when the students are “on fire”.

This means that the teachers only value and are happy with the moments in which the students are usually in top form as regards academic activities.

This is also the time in which they show their excellence in which the teacher takes part of the glory.

this null effect is caused by a weak manipulation and ineffective internal validity. in a scientific study, as the one dr. morimoto is trying to perfom, internal validity refers to the confidence placed in the cause-effect relationship and to how well an experiment is done and able to eliminate confounding variables.        

the invasive species was introduced due to commercial purpouses, as there was a demand for fur clothes and hence, a business opportunity connected to this product. actually, it was when the nutrias scaped, causing harm to the us ecosystems when they acquired the status of invasive species. in this case they have caused an environmental problem, but it could have affected also economic interests or even human health.