Problem: OPTIONS:
- cognitive rhythm
- auditory rhythm
- life cycle
- circadian rhythm
Q: Q: What are regular changes in biology or behavior that occur in a 24 hour cycle? A:
Answer: circadian rhythm

Problem:OPTIONS:
- extraction
- fermentation
- gastrulation
- denaturation

Q: Each protein has its own unique sequence and shape held together by chemical interactions. if the protein is subject to changes in temperature, ph, or exposure to chemicals, the protein structure may change, losing its shape in what is known as this? A:
****
A: denaturation

Q: What sciences are the study of living organisms? A:
OPTIONS:
- physical sciences
- earth sciences
- social sciences
- life sciences
life sciences

Q: The basal forebrain contains what that are important in learning and memory? A:
OPTIONS:
- oxygen
- ribosomes
- atoms
- nuclei

Answer: nuclei

Question: Q: Potassium is a soft, silvery metal that ignites explosively in what? A:
OPTIONS:
- air
- cold
- acid
- water
Answer: water

input: OPTIONS:
- volume
- height
- circumference
- area Now, answer this question: Q: The length of a rectangular surface multiplied by its width is equal to what? A:
A:
output:
area