Of the four factors that effect the evolution of species, which factor is driven by random events? A) genetic variation
B) competitive advantage
C) speciation
D) differential survival and reproduction

The intervention of extraterrestrials has been used to explain the bermuda triangle, a region of the atlantic ocean where ships and planes are frequently lost, leaving no evidence behind. how would this explanation best be characterized?

Which of the following is not a symptom of desertification? a) decrease in salt content of the soil b) lowering of the water table c) reduced surface water d) increased soil erosion e) loss of native vegetation

Draw the structure of dna nucleotide with adenine as nitrogenous base