Which of the following elements does soil needed in the largest quantities to sustain plant life copper iron nitrogen zinc

The table below shows the elements that mainly comprise each of the four layers of earth: elements in layers layer main elements crust oxygen, silicon mantle iron, magnesium outer core iron, nickel inner core iron which of these elements make up the layer that is 0.2 to 1.1 percent of earth's total diameter?

Which correctly describes crossing over ?

The dna sequence ttg is changed to tcg and produces a new protein. which type of mutation is this? missense nonsense silent frameshift