What is the term for changes that occur in most members of a cohort as a result of factors at work during a specific,
well-defined historical period?

During the winter, this species of fox has white fur, but in the summer, it has brown fur. what environmental change may have lead to this fox's fur color? snow cover increase in sun's brightness volcanic eruption global warming

Is there any species that went extinct in recent years due to natural causes (not caused by human interaction). if so, what caused it?

Which situation is an example of not doing work? lifting a couch throwing a baseball running up stairs carrying a box