During the Cretaceous Period, these large animals dominated many of the top nich

Question

During the Cretaceous Period, these large animals dominated many of the top niches in marine ecosystems.

Reptiles

Calcareous nanoplankton

Rudists

Ammonoids

2. Which of the following major groups of organisms went extinct by the end of the Cretaceous Period?
1. Mollusks
2. Ammonoids
3. Giant swimming reptiles
4. Dinosaurs
5. Gymnosperms
6. Rudist corals

1 and 4

4, and 6

5, and 6

3, 4, and 6

What can cause a decrease in calcium concentration in the oceans, and why do sea level transgressions correlate to this?

The evolution of reef-building animals causes magnesium in ocean water to be decreased.

Increased plate tectonic activity includes an increase in rate of spreading at mid-ocean ridges, and there basaltic rocks strain out a larger proportion of magnesium from ocean water.

Volcanic activity decreases, leading to less carbon dioxide output to the atmosphere.

Evolutionary radiations of corals cause more calcium to be released into ocean w

Reptiles

Calcareous nanoplankton

Rudists

Ammonoids

Explanation / Answer

1. Marine Reptiles

2. Marine Reptiles, Dinosaurs and Rudists all got extinct by the end of the cretaceous period.

3. The shells of corals are composed of Calcium carbontes, thus consuming the calcium in the oceans. The proliferation of the corals takes place in the shallow continental shelf region which needs to keep shifting for increase in the population of Corals.

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