)                            (f) transmit impulses in body  

1.      Which of the following is not a type of signaling molecule?                        

(a)    Testosterone

(b)    Insulin

(c)     Thyroxin

(d)    Adenylate cyclase​

Which phrase is the best summary of the model shown? a. the transfer of the sun's energy through trophic levels b. a series of aerobic and anaerobic reactions c. a transformation of light energy into chemical energy d. the breakdown of food molecules

Which kind of worm has a closed circulatory system? a planarian b fluke c pinworm d an earthworm

What are levels of ecology and how can we remember them