Why is it hard to observe winter insects

As the Earth warms overall, insects are shifting toward the poles to colonize areas that are warmer than before in the summer months. Yet many of these insects lack the ability to survive the colder winters found in these regions. ... As the days stay warmer later into the fall, insects' bodies get confused.

Explanation:

answer; i believe that the correct answer is ; males are hemizygous for the x chromosome;