Where do the nitrogenous bases used to form mRNA come from?

In addition to seeds, which of the following characteristics are unique to the seed-producing plants? a) sporopollenin b) lignin present in cell walls c) pollen d) use of air currents as a dispersal agent e) megaphylls

Why is it important that fibrin is insoluble in water?

What maintain homeostasis when a persons internal body temperature is 97.5°f