Pz which of the following is marked by the appearance of organisms with hard parts?
question 8 options:

the beginning of the cenozoic

the end of the precambrian

the end of the mesozoic

the beginning of the cretaceous

the beginning of the Cenozoic

Explanation:

The Cenozoic period began with the 65 million years ago and continuous till today and is composed of the modern-day inhabitants and is also known as the age of mammals and these were as the hornless rhinos and flight less dinosaurs.

Ithink it is space that makes up 70 percent

Answer barren with few trees, in the northern hemisphere;