2. The male duct system consists of: a. The penis, the scrotum and the testes.
b. The prostate, the urethra and the vas deferens.
c. The epididymis, the vas deferens and the urethra.
d. The penis, the urethra and the prostate.
e. The penis, the prostate and the seminal vesicles.

The phlogiston theory in the 17th century attempted to explain burning. the theory stated that combustable objects contained a material called phlogiston, a substance without mass, color, odor, etc. after objects burned, the objects were dephlogistonated and were then in their true form. the phlogiston theory was accepted until the 18th century, when lavoisier proved that combustion requires a gas that has mass. phlogiston is considered a) to be scientific knowledge b) not to be scientific knowledge c) to be proven by scientific method d) to be accepted in the modern scientific community

In many humans, exposing the skin to sunlight over prolonged periods of time results in the production of more pigment by the skin cells (tanning). this change in skin color provides evidence that -

9. the history of life on earth is recorded in