__________ studies involve the use of cells or environments that ...

[ereecah]

__________ studies involve the use of cells or environments that are not part of a living organism.
 Fill in the blank(s) with correct word

Question 2

Iron is important for optimal growth and development because it is _____.
 a. a cofactor for synthesis of the neurotransmitter norepinephrine
  b. a cofactor for DNA synthesis
  c. a structural component of cell membranes
  d. a structural component of bone

[tdewitt]

Answer to Question 1

In vitro

Answer to Question 2

b

[ereecah]

Wow, this really help

[anyusername12131]

YES! Correct, THANKS for helping me on my review