Hormones are
a. produced only in response to environmental stress
b. chemical signals between cells, transported in blood or hemolymph
c. signals that must interact with dna in order to be effective
d. are all under the control of the pituitary gland
e. always proteins

The correct is B Hormones are chemical signals between cells transported in blood or hemolymph.

Explanation:

Hormones are called chemical messenger of the cell because they transmit chemical information from one cell to the target  cell and regulating the functioning of that target cell by activating specific proteins related to the functioning of that target cell.

          Hormone is secreted from its source gland such as Pituitarygland, thyroid gland,adrenal gland.After being secreted hormones are transported via the blood stream to the target cell and binds to receptor of that target cell thus allowing the target cell to exert its biological function.

when you breathe in, or inhale, your diaphragm contracts (tightens) and moves downward. this increases the space in your chest cavity, into which your lungs expand. the intercostal muscles between your ribs also enlarge the chest cavity. they contract to pull your rib cage both upward and outward when you inhale.