Unit Essential Question: How do species change over time and should we intervene? For your project you will argue whether humans should intervene on the behalf of threatened species OR let nature take its course. Use the following table to organize what you learn throughout the tasks, so that you may use it for your culminating project. For each activity, be sure to include answers to ALL the questions provided. Task 2: Evidence of Look back at the fossil record that you created after Task 1. Draw in a pretend common ancestor at the beginning of your fossil record and a pretend modern species also related to this common ancestor. (Feel free to copy & paste what you used for Project Organizer Task 1.) What similar anatomy or embryological development might your species have with this Change Over Time 0 related species?​

Q1: How do species change over time and should we intervene?

SOURCE - https://web.nmsu.edu/~dscoccia/101web/101.evolvscreat.pdf

1) Species change over time; some traits become more common, others less. This process of change is driven by natural selection. The traits that become more common are the ones that are “adaptive” or “increase fitness” (that is, a creature's chances of living longer and producing more offspring). Example: Long necked Giraffes

b) Speciation occurs. The process described in a) continues to the point

where descendants eventually constitute a different species from their remote

ancestors. New species evolve from older ones.

c) The common ancestry of different species. The common/shared

ancestors of more closely related species (e.g. lions and tigers) are more

recent than the shared ancestors of less closely related ones (e.g. tigers and

humans). But we’ll find a common ancestor for very dissimilar species, like

humans and flies, if we go back far enough.

Q2: Evidence of Look back at the fossil record

SOURCE: Khan Academy - https://www.khanacademy.org/science/biology/her/evolution-and-natural-selection/a/lines-of-evidence-for-evolution#:~:text=Fossils%20document%20the%20existence%20of%20now%2Dextinct%20species%2C%20showing%20that,histories%20of%20present%2Dday%20species.

Fossils document the existence of now-extinct species, showing that different organisms have lived on Earth during different periods of the planet's history. They can also help scientists reconstruct the evolutionary histories of present-day species.

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