 because dinosaurs as well as flying and swimming reptiles dominated the environment!

, the Earth looked very different than today! The 

 and seasons weren't as harsh. The ocean was a bit higher because there wasn't any ice at the North or South Poles. Even the shape of the continents looked funny because they were all crammed together, but it wouldn't take long for them to start breaking apart! 

. luckily for us, because it allowed mammals to diversity into the variety of sizes and shapes that we see today. 

 Mesozoic critters that spent all their time in water or in the air are called 

Continue on to the next challenge to test your knowledge on which animals are dinosaurs and which are a flying or swimming reptile. 

Standards for The Mysterious Mesozoic