Label the structures of the male reproductive system. 1.A Urethra, 8 - Testis
2.A Testis, B. Vas deferens
3.A. Vas deferens, B- Urethra

What type of organism is a one-celled organism that functions as a single unit? a. bi-celled b. single-celled c. pre-celled d. multi-celled

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

The main ingredient of magma is a pahoehoe. b silca c dissolved gases d obsidian