cilium

"The smoke detectors in the house are sensors that alert us to fires. "

"The single-celled organism was studied by the biology students in their science class. "

"My grandmother is keeping a strict diet to maintain her health. "

"The scientist studied the unicellular organism under a microscope. "

"The smooth surface of the kitchen table was perfect for setting the dinner plates. "

"The old tree trunk had many rough protrusions that made it difficult to climb. "

""Walking is her primary form of locomotion because she lives close to school." "

"The shelf is projecting about a foot from the wall. "

"The teacher praised the students' similar answers on the math quiz. "

"The birds had built an amazing structure out of sticks and various discarded items."

"Sunlight on the skin gives you vitamin D."

"The organelle called the mitochondrion is responsible for producing energy within a cell, much like a power plant provides energy for a city. "