Problem: OPTIONS:
- peptides
- pheremone
- apoptosis
- auxin
Q: Q: What plant hormone allows plants to curve in a specific direction? A:
Answer: auxin
Problem: OPTIONS:
- air
- cold
- acid
- water
Q: Q: Potassium is a soft, silvery metal that ignites explosively in what? A:
Answer: water
Problem: OPTIONS:
- legs
- head
- neck
- backbone or a spinal column
Q: Q: Vertebrates differ from invertebrates because they lack this? A:
Answer:
backbone or a spinal column