Jamie pushed and pushed on the refrigerator but it would not budge! jamie wondered what he could do to move the heavy refrigerator. he thought about seeing the movers use a dolly with wheels to move boxes and heavy furniture to their moving truck. jamie did not have a dolly but he thought maybe he could put something under the refrigerator to move it. what would be a testable question jamie could use to begin his investigation? a) how do wheels things move? b) why is it so hard to push the refrigerator? c) what can i put under the refrigerator to it move? d) the heavy refrigerator needs wheels so it can move easily.

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