What is the fundamental reproductive unit that the cones of gymnosperms, flowers of angiosperms, and the reproductive fronds of ferns all share in common?

They all have a leaf like organ bearing sporangia.

The question is incomplete, and the options are not given.

Explanation:

The reproductive fundamental units of plants is leaf like organ bearing sporangia. The leaflike organ bearing sporangia are also called sporophylls and they are found within the strobil or flowers of seed bearing plants. Sporangia produced spores either by mitosis or meiosis. In land plants, it's the sites of meiosis where two haploid gametes are produced.

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b. read the phase at the intersection of any given temperature and pressure.