TOEFL Reading Academic Passage Practice #026 - Internal Clocks and Daily Timing

What you will practice

• Reading comprehension
• Evidence and inference
• Time management

Topic: Biology · Read an Academic Passage

Passage preview

Many organisms show roughly twenty-four-hour cycles in sleep, hormone release, body temperature, and activity. These circadian rhythms continue for a time even under constant conditions, demonstrating that they are generated internally rather than being…