D) According to the passage, what could scientists learn about from
studying yawns?
D ways to listen to boring stories
D secrets to becoming a hero
Dreasons why we get sleepy
cures for serious illnesses

In  the diary of anne frank, the characters feel sadness after reading the hopeful message written on the cake. which theme does this best illustrate? peace is often most appreciated after it has been lost.wartime is capable of bringing out the worst in people.  it is important to have someone in whom to confide.sharing difficult experiences can strengthen friendships