Sponges have specialized cells called collar cells. describe how collar cells are specialized for the functions they serve.

Has regulatory areas for thirst, hunger, body temperature, water balance, and blood pressure

Reactants undergo chemical reaction to form products. this chemical equation represents one such reaction. the coefficient for one of the reactants or products is incorrect. which part of the chemical equation is incorrect?

Which of the following cell structures is significantly different between gram- positive and gram-negative bacteria?