Which sentence does not contain any errors in comma usage?
a. in china people first wrote on silk but, then someone invented paper.
b. in china people first wrote on silk, but, then someone invented paper.
c. in china people first wrote on silk but then someone invented paper.
d. in china people first wrote on silk, but then someone invented paper.

List some things you like to do with ur close friends and everyday friends(school)

Examine the table of contents. table of contents fear and its physical effects mental effects emotional effects just say "no! " to breathing exercises meditation yoga free from living free seeking support staying sane index in which chapter would a reader find information on seeking support? fear and its effects free from fear just say "no! " to fear seeking support

How are the two arguments made in the passages different? a. the first passage claims that pets in class will children with health problems; the second passage says pets will make some health problems worse. b. the first passage claims that students’ nervousness will decrease around pets; the second says that students’ nervousness will increase around pets. c. the first passage claims that pets will make the teacher’s work easier by keeping students busy; the second passage says pets will make the teacher’s work harder. d. the first passage claims that pets in school will be good for kids’ mental health; the second passage says pets will be bad for kids’ mental health.