All of the following are evidence that a chemical reaction has occurred except

a. color change

b. formation of a precipitate

c. bubbles of gas

d. all of the above are evidence of a chemical reaction

The spermists believed that: the male made the only hereditary contribution to the offspring the male and female traits were blended in the offspring the female made the only hereditary contribution to the offspring the male and the female made equal contributions to the next generation