What are the two major layers of the skin?

Compare and contrast nutrient limitation in soil vs. nutrient limitation in aquatic ecosystems

Name the plastid and pigment likely to be found in the cells of (a) petals of sunflower (b) ripe tomato.

Jason adds the antibiotic penicillin to a bacterial culture. the bacteria develop genetic modifications in their genome, which gives them resistance to the antibiotic penicillin. what caused this genetic modification?