Q: Q: Snake venom may join the class of drugs collectively known as thrombolytic agents, which can help speed up the degradation of an abnormal what? Choices: - brain - bleed - bone - clot A:
A: clot

Q: Q: There are how many visual clues to indicate a chemical reaction? Choices: - three - five - seven - four A:
A: four

Q: Q: What can damage animal tissues? Choices: - wind erosion - nervous stress - acid and water exposure - extreme pressure or temperature A:
A: extreme pressure or temperature

Q: Q: One of the main features all vetebrates have in common is what? Choices: - hard shell - brain - skeleton - backbone A:
A: backbone