During the Mesozoic Era, the climate on one continent changed from being warm at the beginning to very cold at the end of the era. The climate changed due to the movement of tectonic plates and landmasses. In this era, many organisms became extinct while only some were able to survive. What type of adaptations did these surviving organisms most likely possess?

A. plants with long root systems and animals which laid eggs
B. plants with thorns and animals which gave birth to offspring instead of laying eggs
C. plants with very large leaves and animals which gave birth to large numbers of offspring
D. plants with protective seed coverings and animals with constant internal body temperatures