Stems play an important role in a plant's life except for A. providing support for leaves, flowers, and fruit
B. defensive properties to protect a plant from infection and insects
C. increasing the amount of exposure it receives to sunlight
D. predicting the age of the plant

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

How is the national wildlife refuge system similar to the pacific region coastal program? a. both programs are concerned with providing habitats for wildlife b. both programs are primarily concerned with preserving fish species c. both programs have set aside 150 million acres of land d. both programs are under the u.s. fish and wildlife service

Which law represents a balanced chemical equation?