A macroevolutionary pattern includes background extinction, which tends not to disturb ecosystems, as well as extinction, in which ecosystems change drastically. * a. mass
b. permanent
c. temporary

The truman doctrine was an american foreign policy whose stated purpose was to counter soviet geopolitical expansion during the cold war. it was announced to congress by president harry s. truman on march 12, 1947, and further developed on july 12, 1948, when he pledged to contain threats to greece and turkey

Sugar + oxygen > carbon  dioxide + water + energy  c6h1206 + 6o2 > 6co2 +6h2o + energy  and the numbers after the element symbols are small.     

D. peatlands,grassland,swamps