Precipitation, soil, temperature, humidity, and altitude
The correct answer is absence of jaws.
Lampreys and hagfish are in the class Agnatha, they are jaw-less fish. The members of the agantha class are probably the earliest vertebrates. Scientists have found fossils of agnathan species from the late Cambrian period that occurred 500 million years ago.
A desert is a hot wasteland covered with sand and a tundra is a frozen wasteland covered in ice
