The biceps brachii is responsible for flexing the forearm while the triceps brachii extends the ...

The biceps brachii is responsible for flexing the forearm while the triceps brachii extends the forearm. Muscles with such opposite actions are called
 
 a. cooperative.
  b. antagonistic.
  c. involuntary.
  d. sensory.

Question 2

The female fetal pig is similar to the male fetal pig in that its body
 
 a. has separate openings for the urinary system and the reproductive system.
  b. has a common opening for the urinary system and the reproductive system.
  c. has an opening for the urinary system but none for the reproductive system.
  d. has an opening for the reproductive system but none for the excretory system.