Abandoned railroad tracks are overgrown with weeds. Ten years later there are small aspen trees growing in the middle of the tracks. This change is an example of

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

Suggest why placing wheels under a heavy box reduces the neccessary force required to push it along at a constant speed.

Works together in the synthesis, modification, packaging, and transport of lipids and proteins