7. the diagram illustrates the differences between the skulls and brain volumes of three extinct hominins. in each drawing in the diagram, the shaded area inside the skull indicates the size of the brain. based on the relative size of the brain, which species is capable of more complex behavior, such as the use of tools? a. australopithecus africanus b. all three species were capable of equivalent complex behaviors. c. homo erectus d. homo neanderthalensis

A30 kg weight lies on top of a massless piston of area a = 0.01 m2 the exterior air is at a (constant) p =1 atm and t = 27 c. the interior gas is 0.4 moles of (ideal) n2 and it has initial temperature 27.00 degrees c. 1. what is the initial pressure in the interior? a. 29.4 kpa b. 130.7 kpa c. 101.3 kpa the next three questions concern what happens when an amount of heat q is slowly added to the interior, raising the piston by 1 mm and raising the interior temperature to 27.40 c