Which type of rock is abundant in older rock formations but more rare in newer formations, may contain oil or gas, and is formed by a reaction with a previous sedimentary rock?
A) anthracite
B) bituminous coal
C) chert
D) dolostone
Question 2
What conditions during the formation of coal may reduce its quality for industrial use?
A) Very high heat and pressure are applied.
B) Clay and silt wash periodically through the swamp that formed the coal.
C) The swamp that formed the coal floods.
D) The coal is formed of mostly green plants and contains very few woody trees.
Wild-type versus mutant fly
Switching of mating type in haploid yeast cells
Label the four mutated DNA segments shown below according to the type of point mutation each ...
Tummy rock to release energy blocks in the torso and head.
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The components of the wild-type lac operon