3.Because the mature tissue of velvetleaf contains lots of secondary metabolites such as alkaloid and phenolic, it is difficult to obtain high purity DNA from mature tissue of velvetleaf.
18.With fewer resources and opportunities, it's likely they've experienced more hardship in their lives than the vacationers, so maybe they're more deserving of rescue?
19.They also found that people typically expect more difficulty, less enjoyment, and more romantic regret when they have a lot of people to choose from.
20.That it would be my job that would give me routine and stability when I was dealing with so many difficult personal decisions and so much uncertainty.