Answer the following question given this paragraph: Primates have five digits (fingers or toes) on each extremity. Unlike the hooves of horses or the paddles of whales, the digits of primates are relatively unspecialized. Therefore, they can be used to do a variety of tasks, including grasping branches and holding tools. Q: How many digits do primates have on each extremity? Choices: - ten - four - three - five A:
five

Answer the following question given this paragraph: Cumulus clouds are white and puffy. Convection currents make them grow upward and they may grow very tall. When they produce rain, they are called cumulonimbus. Q: What causes cumulus clouds to grow upward? Choices: - moisture currents - gas currents - mantle currents - convection currents A:
convection currents

Answer the following question given this paragraph: Q: In neurons, what often involves gated sodium channels? Choices: - fermentation - excitation - polarization - depolarization A:
depolarization