HESI A2 Exam Prep 2026

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Practice with exam-accurate HESI A2 questions that match the real test in format, difficulty, and logic. Trusted by students accepted into nursing programs across the United States.

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About Ecology

Greenhouse gases absorb infrared radiation, trapping heat and warming Earth. Human activities have intensified this natural effect.

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Ecology HESI A2 Practice Questions

Free Ecology practice questions for the HESI A2 exam with detailed rationales.

Question 2 of 2

What is the primary cause of the greenhouse effect?
The depletion of ozone in the stratosphere.
The reflection of sunlight by clouds and ice.
The absorption of infrared radiation by greenhouse gases
The release of oxygen by plants during photosynthesis.

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