The precambrian time period is segmented into very few parts because: . a.. the fossil record is scarce. b.. life did not exist. c.. cyanobacteria were the only life form. d.. volcanic activity ruined the fossil record.

The answer is letter A. Fossil records are very scarce to find

The Precambrian era refers to the earliest era of the earth. During this time, there were less evidences of life was found. Though there were some rocks that originated from this era however scientist are not sure if it was in the Precambrian era

the correct answer is: b. pantala flavescens, because these organisms would have a high level of genetic variation due to sexual reproduction.  

because involves two organisms (parents) whose genetic material combines, sexual reproduction leads to genetic variation in new generations of offspring. the offspring is an unique organism, with new genome, more protected with the higher ability to adapted. this process is fundamental to evolution.