African cichlids are a group of closely related fish species. There are at least 500 known species living in three small lakesOver time, specialized teeth and body colorations have evolved for each species in response to mutations and competition for food and mates. This change over time is an example of A.) Convergent Evolution
B.) Divergent Evolution
C.) Vestigial Structures
D.) Coevolution

desert perennials often survive by remaining dormant during dry periods of the year, then springing to life when water becomes available. most annual desert plants germinate only after heavy seasonal rain, then complete their reproductive cycle very quickly.

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.

answer denitrification;