Flat productive cells of the dermal and gastral epithelial found in the sponge are called?

This cells are call the pinacocytes

Explanation:

The dermal layer of a sponges, is the outer layer of ectodermal origin. It has coating cells, the pinacocytes, that line the outer wall of the pinacoderm. They are flat and thin and can cover some internal parts. They are T-shaped and their cell bodies extend inside the mesophyll. They are contractile cells that help regulate the surface area of the sponge.

john maynard keynes developed new economic theories in response to the stock market crash of 1929. great depression of the 1930s. first and second world wars. economic boom of the 1950s.

because the vietnam war was fought in an especially brutal and untraditional way