For the first two weeks of a human pregnancy, the developing ...

[@Brianna17]

For the first two weeks of a human pregnancy, the developing organism is referred to as a(n)
 
  a. zygote.
 b. embryo.
 c. blastocyst.
 d. fetus.

Question 2

Muscle fibers contract when Z lines move _________ and the sarcomeres _________.
 
  a. farther apart; stretch
 b. farther apart; shorten
 c. closer together; stretch
 d. closer together; shorten

[14vl19]

Answer to Question 1

a

Answer to Question 2

d

[@Brianna17]

Thanks for the timely response, appreciate it

[JaynaD87]

Gracias!