Where are collar cells located and what are two functions of these specialized cells

sponge

Explanation:

Collar cells have a sticky funnel-shaped collar and a hair-like whip that is called the flagellum. A cell called an amebocyte takes the food picked up by a collar cell to other cells within the sponge. Collar cells are also called choanocytes

amber has allowed scientists to study dna that has been preserved over millions of years.