Four liters of helium are released into a weather balloon at sea level (pressure 101.3 kPa), To what volume does the balloon expand as it rises to an altitude of 20 km (pressure = 8
kPa)?
Calculate the final ressure in the cylinder of a car engine if the original yolume was 450

How much energy moves onto the next level, in an energy pyramid

Select each correct answer. more than one answer may be correct. which of the following is a characteristic of unicellular organisms? they can possess tissues and organs. all of their functions are performed by a single cell. they are usually microscopic. each of their cells is specialized to perform a specific function.

This drawing shows a human body system. what is the primary function of this body system?