Which statements are correct concerning the evolution model: • incorporates higher order life forms which parallel each other • only a few simple life forms give rise to new kinds of life which will increase in complexity • all life on earth developed from nonliving matter of natural unknown processes • each lower life form can be traced back only to the life form corresponding to a basic kind

The evolutionary theory of the life suggests the complex organism were derived from the simpler ones. Initially, the life started from single celled organism.

The heterotrophic anaerobes are thought to be the first living cells evolved on earth. Later, these bacteria differentiated, and lead to the formation of other multi-cellular organisms.  

Hence, the correct answer is option only a few simple life forms give rise to new kinds of life which will increase in complexity .

correct answer is a. and d.