How did photosynthetic organisms pave the way for the development of other organisms, on Earth?, You were given the fossil of trilobites and asked to explain from where in Earth2019s, history it belonged to. How would you describe this time based on your knowledge, of Earth2019s history?, You observed that an area that had organisms capable of sexual reproduction is, more diverse than an area with only asexual reproduction. How would you explain, this difference?

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How did photosynthetic organisms pave the way for the development of other organisms


on Earth?

You were given the fossil of trilobites and asked to explain from where in Earth’s
history it belonged to. How would you describe this time based on your knowledge
of Earth’s history?

You observed that an area that had organisms capable of sexual reproduction is
more diverse than an area with only asexual reproduction. How would you explain
this difference?

Answer:

Trilobites emerged fully formed upon the Cambrian scene. By the time, some 521 million years ago, that the initial members of this ancient line of arthropods began filling oceanic environments around the globe, they were already creatures with highly developed eyes, complex digestive systems and admirably functional calcite carapaces. Quite simply, at that moment trilobites were the most advanced life forms that Planet Earth had ever produced.

Despite their sudden and dramatic appearance in the fossil record, it is obvious that trilobites evolved from earlier, more primitive organisms. Many of these ancestral creatures may have more resembled segmented worms or articulated jellyfish than the distinctive three-lobed animals that we all recognize today. Those possible early ancestors, such as Spriggina floundersi — found in the 550 million year old Ediacaran-age rocks of Australia — appear to have possessed rudimentary body segments and even primitive genal spines. But despite such somewhat recognizable evolutionary advances, these primeval life forms were a far cry from the Redlichid trilobites that some 30 million years later would dominate the worlds seas.


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