What is the simple predicate of "he did not know that"?

Why is it important to include a descriptive subject heading? it in sorting the topics. it the recipient see its importance. e-mail programs won’t allow e-mail to be sent without it. it keeps junk e-mail separate from important e-mail.

In 250 words, discuss the ways in which the novel relates to the historical context in which it was published.

In  the earth is precious, chief seattle says that man did not “weave the web of life, he is merely a strand in it.” what attitude is he implicitly criticizing by saying this?