How did the cephalopods of the Cenozoic seas differ from the cephalopods of the Mesozoic? What will be an ideal response?
During the Mesozoic Era, the ammonites and belemnites proliferated and were a major
constituent of the marine invertebrate community. After the extinction of the ammonites and
belemnites, many of the cephalopods of the Cenozoic were shell-less forms, such as squids
and octopuses. The nautiloids are closely related to the ammonites, but survived the
extinction event and are still found in the marine environment.
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A. switch to wind turbines B. switch to natural gas C. switch to clean coal D. switch to biofuels
A tuna is an example of a top consumer
Indicate whether the statement is true or false
A ball is tossed straight upward at 40 m/s with no air resistance. One second before it reaches the top of its path its speed is
A. zero. B. 10 m/s. C. 20 m/s. D. 30 m/s
Petroleum and oil reserves are often found in sedimentary rocks because
A. these rocks can contain fossilized organic matter. B. these rocks are very porous and permeable. C. chemical changes occur to create these reserves. D. oil accumulates in the sediments.