Q: How many digits do primates have on each extremity? Choices: - ten - four - three - five A:
five

Q: What causes cumulus clouds to grow upward? Choices: - moisture currents - gas currents - mantle currents - convection currents A:
convection currents

Q: In neurons, what often involves gated sodium channels? Choices: - fermentation - excitation - polarization - depolarization A:
depolarization