Why does each dna sample produce two bands in this PCR? (urgent help needed, its due in 40 mins)

Mineral rich water heated by newly found oceanic crust escapes through cracks in the ocean floor called

In meiosis ii during anaphase ii which structures separated homologous chromosomes or sister chromatids

Which of the following types of pollution is most responsible for large numbers of deaths worldwide because of unsafe drinking water? (a) nutrient pollution (b) thermal pollution (c) pathogen pollution (d) sediment pollution