Q: What type of force exists between two touching surfaces? Choices: - opposing - centrifugal - tension - friction A:
friction

Q: The total energy assimilated by an ecosystem in a give period is known as what? Choices: - size primary production - median primary production - mean primary production - gross primary production A:
gross primary production

Q: Force times distance is the equation for what? Choices: - power - speed - gravity - work A:
work

Q: What is light that has only a single wavelength called? Choices: - primary - fluorescent - spectroscopy - monochromatic A:
monochromatic