Q: Contour tillage helps slow water run-off and what process that causes topsoil loss? Choices: - water erosion - ice shelf erosion - plate tectonics - soil erosion A:
soil erosion

Q: The earliest vertebrates were jawless what? Choices: - mammals - dinosaurs - reptiles - fish A:
fish

Q: How are electrons shared in covalent bonds? Choices: - randomly - orderly - unequally - equally A:
equally

Q: Electromagnetic waves vary in wavelength and in what property, which is lower in waves of longer wavelengths? Choices: - size - density - resonance - frequency A:
frequency