One type of early protocell (pre-cells) probably consisted of small droplets of
A) water
B) clay
C) concentrated amino acids
D) nucleic acids
C
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What will be an ideal response?
Radioactivity Basics: Polonium-216 decays to lead-212 by emitting what kind of nuclear radiation?
A. alpha B. beta-minus C. beta-plus D. gamma E. x-rays.
A projectile is shot from the edge of a vertical cliff 60.0 m above the ocean. It has a speed of 100 m/s and is fired at an angle of 35.0° below the horizontal. How far from the foot of the vertical cliff does the projectile hit the water?
A) 79.1 m B) 312 m C) 684 m D) 1084 m E) 540 m
A composite volcano is formed by
A) successive flows of fluid basaltic lava. B) a mixture of rock and lava. C) alternating layers of lava, ash, and mud flow debris. D) the accumulation of ash, cinders, and rock debris.