Chapter 29, Problem 10RQ

To determine

The effects on the life forms during the Paleozoic era due to several fluctuations in the sea level.

Answer to Problem 10RQ

The fluctuations in the sea level during the Paleozoic era greatly influenced the progression and diversification of life forms like the evolution of shell, mainly in the marine life of organisms.

Explanation of Solution

The Paleozoic Era encountered several shifts in sea level, and these variations influenced life forms. During the Paleozoic Era from 543 million years ago to 295 million years ago, the sea level rose and fell that result in covering of lower altitude area of land. Thus, during this event, the habitat of marine organisms expanded considerably following in the development of diversified marine and aquatic life.

It was the period of evolution, and many organisms developed the ability of secrete calcium carbonate and calcium phosphate to produce the outer skeleton called the shell. The shell increased protection against predators and helped in the protection from harmful UV radiation.

Conclusion:

Therefore, the fluctuations in the sea level during the Paleozoic era greatly influenced the progression and diversification of life forms like evolution of shell, mainly in the marine life of organisms.