Why haven’t any huge animals evolved since the end of the Jurassic?
Warmer temperatures would be beneficial
By Bob Knows
During the Jurassic, huge animals and plant life flourished BECAUSE OF high temps.
All chemical activity is much more rapid at higher temperatures, and life evolved as adapted to higher temperatures. Very rapid plant growth caused by high temps and plentiful water and CO2 produced massive quantities of feed for huge animals.
Since that time plant species have adapted to very marginal temperatures just barely (sometimes) above freezing, and plants adapted to survive on marginal CO2 levels while freezing out for half the year.
The question was asked half a century ago, “Why haven’t any huge animals evolved since the end of the Jurassic?” There has been plenty of time.
Because there hasn’t been enough heat and food for massive animals. We’re a near-starvation species living on a near-starvation and nearly-frozen planet.