Assume that a modern rabbit dies and becomes fossilized. Which of the following

Question

Assume that a modern rabbit dies and becomes fossilized. Which of the following groups of animals would represent an accurate fossil assemblage to find with that rabbit? A) Coral, brachiopods, and fish B) Squirrels, birds, and mice C) Trilobites, brachiopods, and clams D) Fish, birds, and coral A Devonian-aged limestone contains fossils of brachiopods and bryozoans. What do these fossils indicate about the environment during the Devonian period? A) Arid B) Coastal swamp C) Delta D) Shallow marine In radioactive decay, an unstable __ isotope will decay into a stable ___ isotope: A) ion: carbon B) parent: daughter C) daughter: parent D) neutron: ionized What is the ultimate source for naturally occurring carbon-14? A) Cosmic ray collisions and neutron capture involving nitrogen B) Dissolution of carbonate rocks C) Decay of unstable parent isotopes to create a stable carbon-14 D) Volcanic eruption and emission of greenhouse gases

Explanation / Answer

45. Answer: D. Shallow marine
Explanation: Brachiopods have an extensive fossil record, first appearing in rocks dating back to the early part of the Cambrian Period, about 525 million years ago. They were extremely abundant during the Paleozoic Era. Most brachiopods live in relatively shallow marine water, up to about 650 feet (200 m), but some species have been found at depths of more than a mile.Bryozoans are some of the most abundant fossils in the world. They are also widespread today, both in marine and freshwater environments. Marine bryozoans show up in the fossil record in the early part of the Ordovician Period.

46. Answer: B. parent; daughter

Explanation: Radioactive deacay is the continue process of breakdown of unstable radioactive isotopes into other stable radioactive isotopes. In this process the unstable isotopes are called as parent isotopes and resultant isotopes after the decay is called daughter isotopes. In this process large amount of energy relesed which is used mostly for the electricity generation. The plants where this types of reaction carried out manually is called nuclear power plant.

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