How long does it take for 90% of carbon 14 atoms to decay?

One element of lyrical poetry is personal reflection. which line is n this poem most clearly illustrate that element

What is the central idea in this advice from branch rickey to jackie robinson?  

How can you avoid the problem of groupthink? a. by choosing a group leader to direct the group b. by composing the team of only like-minded individuals c. by encouraging all members to voice their opinions d. by keeping quiet when you disagree with another group member's opinion