flagella

"The student used a microscope to see the tiny cells in the plant leaf. "

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

"The small toy airplane had two propellers that spun quickly, lifting it into the air. "

"to enclose lands"

"The rider whipped the horse."

""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. "

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

"Vegetables are a good source of nutrients for a healthy diet. "

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

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