What is the 2nd stage for both flowering & non-flowering plants?

The 2nd step is germination.

Explanation:

Seeds need four things to grow: oxygen, moisture, sunlight, and the right temperature. When the proper conditions are met for the seed, it will begin to sprout. The roots push their way through the seed coating and begin growing into the soil. This process is called germination.

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explanation:

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when atoms of different types of elements join together, they make molecules called compounds. water consists of compound molecules made up of 2 hydrogen atoms and 1 oxygen atom. this is why it's called h2o. water will always have 2 times the number of hydrogen atoms as oxygen atoms.