Four friends were hiking in the mountains when they came across a shell fossil like the one pictured to the right. The friends agreed that the fossil of the organism clearly came from the ocean, but they were confused about how the fossil ended up high on a mountain. Here is what each friend thought: Carlos: It belonged to a hiker and fell out of their backpack during a hike. Jenny: The land must have been covered by water long ago. Jordan: An animal carried the shell up the mountain and dropped it. Marcus: Weathering, erosion, and deposition slowly moved the shell up the mountain. Which friend do you agree with the most from the “Take a Hike” scenario? How do you think the fossil ended up on the mountain? Explain your answers.

Heat from earths interior and pressure from overlying rock transform the remains of marine sediments into

Archeologists have discovered three sites showing conclusive evidence for the mastery of fire in tanzania, from a period slightly after the time that homo habilis was present in africa. these sites clearly were founded by homo erectus, the descendent species of homo habilis that migrated north, out of africa and into asia. homo erectus was known to have mastered fire, from ample evidence at sites in asia. there is no reason to attribute mastery of fire to homo ergaster, the descendent species of homo habilis that remained in africa.which of the following is an assumption on which the argument depends? (a) before their migration, homo erectus occupied african territory as far south as tanzania.(b) the strain of migration provided the selective pressure motivating homo erectus‘ mastery of fire.(c) homo ergaster would not have derived as much benefit from the mastery of fire as did homo erectus.(d) homo ergaster inherited all cultural knowledge from homo habilis, a species that did not have mastery of fire.(e) homo ergaster did not occupy regions as far south as tanzania until well after the time of these three sites.

To test the responsiveness of the kidneys, scientists have designed an experiment tracking urine output of people during a normal day, while regulating the in-take of water by mouth. what would be an appropriate hypothesis for this experiment?