flagellum

"I searched the garden for the keys and found them in the vegetable patch."

"The scientist examined the sample and found a bacterium, a tiny cell without a nucleus, under the microscope. "

"The biology teacher explained that protists, like some single-celled algae, are a diverse group of organisms. "

"to enclose lands"

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

"The cell membrane controls what enters and leaves the cell. "

"The doctor identified the specific bacteria causing the student's illness. "

"Feed the dog every evening."

"The egg white is a proteinaceous substance, providing essential building blocks for the developing chick. "

"The octopus uses its appendage, a tentacle, to grab food from the ocean floor. "

"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. "