Question

Match the correct age in years with its major evolutionary event, as determined by the fossil:EVENTS:1. First prokaryotic cells evolved.2. Photosynthetic prokaryotes evolved, releasing O2 into the atmosphere.3. First eukaryotic cells evolved.4. First multicellular life evolved.AGE:A. 650 millionB. 2.1 billionC. 2.8 billionD. 3.5 billion

Answer 1

1.

The first prokaryotic cells (the less complex in its organization and with no organelles involved in membranes) evolved about 3.5 billion years ago. Therefore, the correct answer is D. 3.5 billion.

2.

Then, some prokaryotic cells evolved to use the sunlight to produce energy and release O2 into the atmosphere about 2.8 billion years ago. Therefore, the correct answer is C. 2.8 billion.

3.

After that, the prokaryotic cells evolved to cells with organelles bounded by membranes, and then the eukaryotic cells evolved about 2.5 billion years ago. Therefore, the correct answer is B. 2.1 billion.

4.

A long time after that, aproximately 650 million years, the first life composed of an organism with multiple cells evolved. Therefore, the correct answer is A. 650 million.