Phospholipids and glycolipids form bimolecular sheets because of a the presence of two fatty acyl chains. b. the differing interaction between polar head groups with one another. c. the differing interaction between polar head groups and water. d. the differing interaction of hydrophobic fatty acyl chains.

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.

the correct answer is d

the correct answer is 4) heat and pressure

metamorphic rocks arise from transformation of existing rocks types, in a process called metamorphism. during metamorphism the original rock(prolith) change into metamorphic rock by heating (150-200c) and pressure of more than 1000 bar. the original rock can be sedimentary, igneous, or existing metamorphic rock.