Given a scientific passage and an answer, generate a question for the given answer.

Passage: Like a blanket on a sleeping person, greenhouse gases act as insulation for the planet. The warming of the atmosphere is because of insulation by greenhouse gases. Greenhouse gases are the component of the atmosphere that moderate Earth's temperatures. Answer: insulation
Like a blanket on a sleeping person, greenhouse gases act as what for the planet?

Passage: Chlamydia is the most common bacterial STI in the U. S. Females are more likely to develop it than males. Symptoms may include burning during urination and a discharge from the vagina or penis. Answer: chlamydia
What is the most common bacterial sti in the u. s.?

Passage: Ecosystems need a constant input of energy to supply the needs of their organisms. Most ecosystems get energy from sunlight. A few ecosystems get energy from chemical compounds. Answer: sunlight
Where do most ecosystems get energy from?