Why is clostridium killed by oxygen, where as Strptococcus is not?

Clostridium and Streptocaccus are both catalase-negative; Streptocaccus  grows by fermentation. Why is clostridium killed by oxygen, where as Strptococcus is not?

"Our Prices Start at $11.99. As Our First Client, Use Coupon Code GET15 to claim 15% Discount This Month!!":

Get started