During which era did mosses, ferns, and conifers first appear? 8.
e.6a.1 * cenozoic mesozoic paleozoic

The first land plants appeared around 470 million years ago, during the Ordovician period.

Ithink d hope that

It is a mixture. simply put, a compound must be pure, that is, of only one chemical structure and composition. a mixture is made of different chemical substances (i.e. elements, molecules, compounds) that are not chemically bonded to each other, but instead physically grouped together, as in the case of gasoline (a homogeneous solution).