Using your timeline and the ESRT, please answer the following questions in complete sentences stating your CLAIM first and then providing EVIDENCE in support of said claim in a logical progression where applicable.
Look at your timeline to answer the following questions:
1) How did you create the timeline and what does your timeline allow you to conceptualize (see or think about) that the timeline in the ESRT did not (what was the reason for making the timeline).
2) If you were going to compare your life to Earth’s life, how old would you have been when (a) The first rocks found? (b) The first multicellular creatures existed? (c) The first dinosaurs existed?, (d) The first humans existed? And (e) The first birds existed?
3) If you compare your life to the Earth’s life, how many years of your life would have been spent between (a) the first single celled organism and the first trilobite? (b) the first dinosaur and the extinction of the dinosaurs?
4) If you compare your life to the Earth’s life, how many years of your life would have been spent from the time cyanobacteria began producing oxygen to the time oxygen began entering the atmosphere?
You may use both your timeline and the ESRT to answer the following:
5) What can you conclude about the rise of living things? Did the rise of new organisms and the diversification of living things occur at an even rate over the entire history of Earth? Claim? Evidence?
6) What was the longest division of time in Earth’s history (Eon)? Approximately what percentage of Earth’s history occurred during this division? (Remember, to do percentage you take the length of time of the event you are looking at, divide by the total number of years of Earth’s existence, and multiply by 100).
7) Relate this long division of Earth’s existence to your own life (Eon). About how many years of your life is proportional to the longest division of time in Earths history?
8) What was the length of time Earth existed before the first sexually reproducing organisms? Approximately what percentage of Earth’s history occurred during this division?
9) Why do you think it took so long for most life to form? Claim, Evidence.
10) Why do you think scientists coined the phrase “Cambrian Explosion”?
Use timeline to arrive at the following answer.
Assuming that humans have been alive for 2 million years, to what length of time in your own life is this proportional? Hint for finding proportion (percentage) take time humans were around (2 million years) and divide it by Earth’s existence (4,600 million years) then multiply by 100.