Khan academy p/s passage

This forum made possible through the generous support of SDN members, donors, and sponsors. Thank you.

akimhaneul

Full Member
7+ Year Member
Joined
Dec 2, 2015
Messages
438
Reaction score
23
For this one, are A, C, and D pretty much the same answers?

Also, if one person gets STD, then in the long chain version, can't the disease still spread?

Members don't see this ad.
 

Attachments

  • Screen Shot 2016-08-26 at 6.58.51 PM.png
    Screen Shot 2016-08-26 at 6.58.51 PM.png
    57.2 KB · Views: 47
  • Screen Shot 2016-08-26 at 6.59.02 PM.png
    Screen Shot 2016-08-26 at 6.59.02 PM.png
    76.3 KB · Views: 50
  • Screen Shot 2016-08-26 at 6.59.08 PM.png
    Screen Shot 2016-08-26 at 6.59.08 PM.png
    55.7 KB · Views: 53
  • Screen Shot 2016-08-26 at 6.59.16 PM.png
    Screen Shot 2016-08-26 at 6.59.16 PM.png
    113.4 KB · Views: 35
Top