Which class should I take with Chem6BL?

<p>I'm taking this Filipino Heritage Language class, The Beatles, and Chem6BL. I'm also taking an upper div bio class.
Which upper division bio class should I take out of these 3?
Mamm Phys 1 with Prof. French or her husband
BIEB ...some upper division ecology/environmental class with Prof. Halloway
BIBC 100, structural biochem with Stephanie Mel</p>

<p>Which class is more difficult? mamm phys or structural biochem?</p>