A.Organic compounds contain hydrogen, oxygen and carbon
B.Complex organic compound were first formed on the primitive earth
C.Life originated in form of amino acid
D.The organic compound can be synthesized in the laboratory
A.1-2 billion years ago
B.7-10 billion years ago
C.7-19 million years ago
D.1-2 million years ago
A.DNA and histones
B.DNA or histones
C.Only DNA and no histones
D.Neither DNA nor histones
A.Steam, Methane, Hydrogen and Ammonia
B.Methane, Carbondioxide, Oxygen and Hydrogen
C.Ammonia, Oxygen, Hydrogen and Water
D.Methane, Hydrogen, Nitrogen and steam
A.Ornithology
B.Saurology
C.Aves
D.Malacology
A.Craniology
B.Nidology
C.Ichnology
D.Myremecology
A.Carbon
B.Hydrogen
C.Nitrogen
D.Water
A.Ecology
B.Sociology
C.Ethology
D.Anthropology
A.Herpetology
B.Horology
C.Hepatology
D.Haematology
A.Organisms arose not only from other similar organisms but also spontaneously
B.Organisms always arose spontaneously
C.Organisms arose only from air
D.Organisms arose only from other similar organism
