Which of the Following Is Not an Observed Effect of Global

Multiple Choice

Which of the following is not an observed effect of global warming on organisms?

A) Some species of birds and frogs now begin their breeding seasons later in the year.
B) Corals "bleach" when increased water temperatures cause them to expel their symbiotic algae.
C) Many butterfly populations have shifted their ranges to the north.
D) Many polar bears show signs of starvation as their hunting grounds melt away.