Life on Earth Timeline of Species Lab Report

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Answer the questions in the uploaded file correctly. Let me know if you need any clarification.

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In the last lab activities you explored adaptations, which are caused by evolution slowly causing changes to the shape, physiology, or behavior of a species to be better suited its habitat. These changes normally happen over a long period of time. For most people, even biologists, it is difficult to appreciate the time scale these changes to life actually take. This is because we talk about changes taking thousands or millions of years, when humans only live around 100 years (if they are lucky). In this activity, you will examine the time line of major biological events on Earth to gain a better understanding of how long some evolutionary changes take. The time line is estimated from the fossil record. Below is a blue line representing the entire existence of Earth, which is estimated to have formed 4.56 billion years ago (bya). The far right side represents present day. For each of the questions below, make your best guess as to which letter marker (A-Z) in the figure above lies closest to where the event occurred. Note: You may use the same letter more than once for different questions (e.g. Q1 = A , Q2 = A), but don't put down two or more letters for one question (e.g. Q1 = AB). You will get full credit regardless of what letter you choose. Just take your best guess. First life appears (algae & bacteria): First multicellular life: First land animals (amphibians): First dinosaurs: Dinosaurs go extinct: First modern humans: Please write down your letter guess for a later question. To get a sense of when various biological events occurred since the formation of the planet, view the short video below. All of the events from the last question are represented in the video. One confusing thing is that the video has an event called "Beginning of 'life': first evidence of replicating molecules", which is when biological molecules first formed, not the first cells. The next event is called "The first photosynthetic organisms convert...", which is when the first cells (algae and bacteria) appeared. https://www.youtube.com/watch?v=ck8i0_BHg_0 Below is the timeline with markers indicating when important biological events occurred. Were you very close in your original guesses? Group of answer choices Yes, incredibly close. Kind of. Not really. What was the most surprising thing you learned from making your timeline guesses and then seeing the answers?
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Complete! I watched the video and answered all of the questions on the document!

In the last lab activities you explored adaptations, which are caused by evolution
slowly causing changes to the shape, physiology, or behavior of a species to be
better suited its habitat. These changes normally happen over a long period of
time. For most people, even biologists, it is difficult to appreciate the time scale
these changes to life actually take. This is because we talk about changes taking
thousands or millions of years, when humans only live around 100 years (if they ar...


Anonymous
Excellent resource! Really helped me get the gist of things.

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