Week 21 · Term Three · Life in a sealed city
Solve the real mystery of Biosphere 2’s vanishing oxygen, balance a sealed city’s water, spot a biased survey, follow the body’s feedback loops, and explain the loops that keep a dome steady or send it spiraling.
Monday uses photosynthesis and respiration to explain why Biosphere 2 lost oxygen. Tuesday budgets a water-recycling loop with percentages. Wednesday trusts a random sample over a biased one. Thursday traces negative feedback in the body. Friday explains a steadying loop and a spiraling one.
25 minutes
Biology · Where did the oxygen go?
Explain how photosynthesis and respiration cycle carbon and oxygen, and use evidence to find what upset the balance in a closed system.
Make
A oxygen investigation
City handoff: The investigation is filed. Tomorrow the dome needs water.
25 minutes
Architecture · The water loop
Use percentages to find what a recycling loop loses, and check whether a supply covers it.
Make
A water budget
City handoff: The water budget is filed. Tomorrow you survey the residents' health.
25 minutes
Statistics · Who did you ask?
Explain why a random sample represents a population and a convenience sample may not, and use a good sample to make an estimate.
Make
A survey review
City handoff: The survey review is filed. Tomorrow you look at how the body fixes itself.
25 minutes
Health · Homeostasis and feedback
Describe how body systems work together to keep conditions stable through negative feedback.
Make
A feedback diagram
City handoff: The feedback diagram is filed. Tomorrow you explain the dome's loops.
30 minutes
Explanatory writing · Loops that steady or spiral
Explain negative and positive feedback loops in a system, with each step causing the next, and state the model's limits.
Make
A City systems intervention
City handoff: The systems explanation is filed. The dome now has a model builders can check, and a warning they can use.
The intervention uses only work entered here. It is a family record of this week’s work, not a grade, an attendance record, or proof of mastery.
