Which species of protist are known as the whirling whips because of the spins produced by two flagella beating in opposing grooves along their hard surfaced bodies?

Which species of protists are known as the whirlin whips?

Which one of the following protists is known as 'whirling whips' because of the spin produced by two flagella beating in opposing grooves along their hard surfaced bodies ?

Whirling Whips are protists which possess two flagella that beat

Whirling Whips are protists which possess two flagella that beat

Whirling Whips are protists which possess two flagella that beat