What element is found in the nuclear reactor core?

What protects the lining of the stomach from acidic gastric juices?

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

What is the role of dna ligase in the elongation of the lagging strand during dna replication?