Hel As an airplane rises through the atmosphere, machines cause the pressure inside the
cabin to decrease. Based on your observations from the Can Crush Lab, why is this
change in pressure necessary?
A. Air pressure inside the plane should match the air pressure outside the plane.
B. Air pressure outside the plane should be more than the air pressure inside the
plane.
C. Air pressure outside the plane should be less than the air pressure inside the
plane.
D. Air pressure inside the plane should be less than the air pressure outside the
plane.

You will create a molecular clock model for an arthropod gene. follow these guidelines to make your model: . your timeline will span from 90 million years ago to the present. the common ancestor in your model is an arthropod that lived 90 million years ago. the gene that you'll track codes for a protein in the species venom . the dna sequence youll track contains 10 nitrogen bases. you can choose the order of the bases and where the mutations occur. this gene mutates at a rate of approximately 0.76 base pairs every 17.1 million years. to build your model,/ calculate the estimated time period it takes for 1 base pair to mutate. the first time period will only show the common ancestor. at the beginning of the second time period, three lineages will diverge from the common ancestor, each with a different mutation in their gene sequences. the first and third descendant species will survive for the rest of the timeline. the second descendant species was extinct 50 million years ago. calculate how long it will take for one full base pair mutation to occur. explain your reasoning by constructing a mathematical equation