A fair coin would be expected to land on heads 75 times.
The first land vertebrates appeared in the: Devonian
A Jaw Eggs that would not dry out
i would expect people to do a lot of farming
Tetrapods
There were many challenges that vertebrates had to overcome in order for them to colonize land habitats. Three of the most challenging tasks that vertebrates had was to learn how to eat the food on the land to sustain their energy and nutritional needs, how to breath, and how to defend themselves against predators.
Vertebrates are animals with a backbone, so some vertebrates live in water (e.g. fish) but others live on land (e.g. cows).
Like other land vertebrates, Stegosaurus would have inhaled and exhaled through its nostrils and sometimes its mouth.
On leveled land~!
what variation would helpa land plant survive if long lasting droughts developed?
4
On leveled land~!