Difference between pure and mixed culture

Which of the following is most important in making the typical seed more resistant to adverse conditions than the typical spore? a) a different type of sporopollenin b) an internal reservoir of liquid water c) integument(s) d) ability to be dispersed e) waxy cuticle

How can scientists test their ideas about the origin of the universe if they can't physically interact with or study?

(99 points) be serious! how do farts work? how do you fart without it stinking? serious answers only