A Triassic extinction is a boundary between the Triassic<span> and Jurassic periods, 201.3 million years ago, and is one of the major </span>extinction<span>events of the Phanerozoic eon, profoundly affecting life on land and in the oceans.</span>
<u>At low light levels, green leaves are most efficient at photosynthesis. On a sunny day, however, there is essentially no difference between red and green leaves' ability to trap the sun's energy.</u>