Which was not a gas in Earth's earliest atmosphere?
A) O₂
B) CH₄
C) NH₃
D) H₂
Correct Answer:
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Q7: The practice of using bacteria to remove
Q15: Some bacteria have a spherical shape,called _.
A)coccus
B)bacillus
C)spirillum
D)spheroid
Q16: Which are the smallest,least complex cell types?
A)Animal
Q17: The origin of the first living organisms
Q20: By what means do bacterial cells typically
Q21: Which organelle could you remove and the
Q22: When a plant cell divides,how would you
Q23: Which was first on the planet,prokaryotes or
Q23: What do the nucleus and the smooth
Q24: By what means do the amoebas move?
A)Flagella
B)Cilia
C)Pseudopodia
D)Amoebas
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