Standby Agreement. An agreement between the issuer of a security and its underwriters stating that the underwriters are responsible for any unsold portion of the issue. That is, the underwriters agree to buy the remainder of a new issue if they are unable to place its entirety with investors.
A sponge has water flow in through the pores. The water contains the food and oxygen the sponge needs. Respiration. A sponge takes in water through its pores and in more advanced forms, with canals that move the water to all throughout the sponge.
The beating of the choanocytesâ flagella creates the spongeâs water current. * Porocytes are tubular cells that make up the pores into the sponge body through the mesohyl. * Pinacocytes which form the pinacoderm, the outer epidermal layer of cells. This is the closest approach to true tissue in sponges.