Use the drop-down menus to identify the terms described below. a group of cells that secretes substances into the blood or directly into an organ a substance produced by cells that specific groups of cells to perform specific functions a channel or tube that conveys a substance

gland  a group of cells that secretes substances into the blood or directly into an organ

hormone a substance produced by cells that helps specific groups of cells to perform specific function

duct a channel or tube that conveys a substances

explanation:

the universal gravitation equation. since the gravitational force is directly proportional to the mass of both interacting objects, more massive objects will attract each other with a greater gravitational force. if the mass of one of the objects is doubled, then the force of gravity between them is doubled.