Question 1
Which statement describes what the graph shows after about year 17?
Get ready for AP Environmental Science, one data set at a time.
Read the graphs and do the calculations the exam asks for in a free 17-minute diagnostic, fix your weakest unit with a short lesson, then answer free-response questions with Mia's feedback on every point.
The only interactive course with a tutor that finds your weak spots and fixes them.
One payment in US dollars. Full refund within 14 days, for any reason.
Practice the calculations, free
Percent change, the rule of 70, the 10% rule, half-life and energy conversions: each drawn on a graph, each with the setup and units the free response gives points for. No account.
1. Solve it: percent changeAs many rounds as you like
The nesting pairs of a seabird on Island S went from 50 pairs in 2005 to 13 pairs in 2025. What was the percent change?
2. Move the growth rateRule of 70
Set a growth rate and watch the curve: at a steady percent each year, the amount doubles again and again in equal times.
- Doubling time
- About 35 years
- After 100 years
- 724 (from 100)
70 ÷ 2 ≈ 35 years. A population, an energy demand or a city's water use growing 2% a year doubles in that time.
The free diagnostic, 17 minutes
15 questions across all nine units, weighted like the exam, a third of them on a graph, table or model. No account. You get your score by unit and by science practice, the unit to fix first, a short lesson on it and a plan to May.
Answer a free-response question, and Mia coaches you
Ten points a question, as on the exam. Mia reads every part, quotes the words that earned each point, checks a calculation's setup and answer separately, and for a point you missed says what the task verb needs and asks you a question to get there. She never writes the answer for you. Free, no account.
The nine units
The May 2027 exam: 80 multiple-choice questions in 90 minutes, then 3 free-response questions in 70 minutes, on Thursday, May 13, 2027. A calculator is allowed on both sections.
Unit 1: The Living World: Ecosystems
Biomes, the carbon, nitrogen, phosphorus and water cycles, productivity and the 10% rule.
6–8% of the multiple choice
Unit 2: The Living World: Biodiversity
Biodiversity, ecosystem services, island biogeography, tolerance and succession.
6–8% of the multiple choice
Unit 3: Populations
r and K strategies, survivorship, carrying capacity, age structure and the demographic transition.
10–15% of the multiple choice
Unit 4: Earth Systems and Resources
Plate tectonics, soil, the atmosphere, winds, watersheds, seasons and El Niño.
10–15% of the multiple choice
Unit 5: Land and Water Use
The commons, farming, irrigation, meat production, fishing, mining, cities and sustainability.
10–15% of the multiple choice
Unit 6: Energy Resources and Consumption
Fossil fuels, nuclear power, renewables, efficiency and energy calculations.
10–15% of the multiple choice
Unit 7: Atmospheric Pollution
Smog, thermal inversions, indoor air, acid rain, noise and how to cut each.
7–10% of the multiple choice
Unit 8: Aquatic and Terrestrial Pollution
Point and nonpoint pollution, eutrophication, waste, sewage, LD50 and dose-response.
7–10% of the multiple choice
Unit 9: Global Change
Ozone depletion, the greenhouse effect, climate change, ocean acidification, invasive and endangered species.
15–20% of the multiple choice
Try four questions
Reindeer on Island R
Thirty reindeer were released on Island R, which has no predators. Their main winter food is lichen, which grows back very slowly. The dashed line marks the biologists' estimate of the island's carrying capacity when the reindeer arrived.
Question 2
The food web shows a cabbage field. A farmer using integrated pest management wants to control caterpillars by biological control. Which action does the food web support?
Electricity and carbon dioxide from three power plants
The table gives the electricity each plant generated in one year and the carbon dioxide it released.
| Plant | Electricity (million kWh) | Carbon dioxide (million kg) |
|---|---|---|
| Plant P (coal) | 2,000 | 2,000 |
| Plant Q (natural gas) | 2,000 | 900 |
| Plant R (oil) | 1,500 | 1,200 |
Question 3
How much carbon dioxide does Plant Q release for each kWh of electricity it generates?
Question 4
The model shows the steps of the greenhouse effect. Which step grows stronger as the concentration of greenhouse gases rises?
In the course
- 24 interactive lessons
- 153 practice questions
- 15 free-response questions with Mia's feedback
- 2 full practice exams
Guides and free tools
- AP Environmental Science math practice: a free calculation drill
- The AP Environmental Science exam in 2027: format, date and length
- Is AP Environmental Science hard?
- AP Environmental Science pass rate and score distribution
- How much does the AP Environmental Science exam cost?
- AP Environmental Science free-response questions: how they are scored
- AP Environmental Science calculator rules for 2027, and a free formula calculator
- AP Environmental Science study planner for May 2027
- AP Environmental Science score calculator
Environmental Science Genius Pro
US$49one payment
- 24 interactive lessons
- 153 practice questions
- 15 free-response questions marked point by point
- 2 full practice exams
Full refund within 14 days. Ask within 14 days of paying, for any reason. Our refund promise still applies after you start the course. The note under the pay button is about the separate legal right to cancel. Terms
By paying you agree to our Terms. Email us within 14 days for a full refund.
Take the free diagnostic firstApple Pay, Google Pay or card. Charged in USD.
One payment. No sales tax is added. Access until October 31, 2027.
Questions? support@unigenius.co.uk