The red maple tree is a flowering plant. The longleaf pine tree is a nonflowering plant. Both trees go through various stages in their life cycles. Which stage occurs in the life cycles of both trees?

making seeds

Explanation:

The plant that bear flower at least once during its life cycle, it is said to be a flowering plant. Bearing flower is an essential part of the process of reproduction of a flowering plant.

The plant that never bear a flower in its life cycle but still is able to produce the seeds, is said to be a non-flowering plant.  

The fact common in both the flowering and non flowering plants is that both of them produce seeds.

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