History

Now dont get overwhelmed here! I will not ask you to memorize the exact years that scientists necessitate evidence that each type of life appe atomic number 18d on solid ground. What is important is that you understand that at this point we feel macrocosm was formed about 4.5 billion years ago; and that Prokaryotes came in the first place Eukaryotes (these are the smallest forms of life and two different types of cells). Scientists also surrender evidence that Oxygen was being produced by photosynthesizes anterior to plants colonizing the charge;and that man did not live at the same magazine as the dinosaurs!

This figure from your text, visually illustrates the same information of the prior slide. The origin of the Earth, at 4,500 million years ago, starts at the loafer (move your decimal point and youll see that is the same as 4.5 billion). As you work your way up the figure in that respect are indicators of the first prokaryotic fossil, oxygen from photosynthetic cyanobacteria, to the first animal, dinosaurs and in conclusion humans. The fact that humans havent been around really long, yet having such a huge impact on the Earth will be something we discuss later in the course.

As slide 2 and 3 indicated, Prokaryotes lived on the Earth prior to Eukaryotes.

The picture on the left is a microscopic, 3.5 billion-year-old Australian fossil.



This fossil gives scientists one piece of evidence to support the report that Prokaryotes were here first. The picture on the right shows modern sidereal day orange colored bacteria on the head of a peg. See how many bacteria there are? If this pin were to pierce through your skin the bacteria would now have a way to enter your body and you could get an infection.

fathert be fooled by their size, Prokaryotes are everywhere. Many quantify misunderstood, the can both cause disease and be beneficial.

there are two evolutionary branches of Prokaryotes: Bacteria and Archaea. In this severalise we will focus on the bacteria. However, it is important for you to know that there are two branches in the...If you want to get a full essay, order it on our website: Orderessay



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