Which sentence from the passage includes a subordinating conjunction?

“The principle behind biomimicry is not simply to copy nature, but to look at the designs that we can see in nature and use those designs to help solve human problems.” (paragraph 2)

“As these contemporary architects strive to create these structures, they turn to various designs in nature to inspire them.” (paragraph 3)

“Spanish architect Antoni Gaudí was inspired by a forest canopy when he designed the Sagrada Familía Basilica.” (paragraph 13)

“One of the clearest examples of biomimicry is found in the buildings that we live and work in.” (paragraph 3)