Q: When a wave travels down a string, the string vibrates up and down at right angles to the wave's what? Choices: - frequency - pressure - gravity - direction A:
direction

Q: What do you call any substance that opposes coagulation? Choices: - dissolvent - antibodies - toxin - anticoagulant A:
anticoagulant

Q: What part of blood releases clotting factors? Choices: - hemoglobin - white blood cells - erythrocytes - platelets A:
platelets