an autotrophic organism that grows on land, has vascular tissues, but does not produce seeds is probably a

The correct answer is - fern from kingdom Plantae.

Explanation:

Vascular tissues and seeds are found in the Plantae kingdom in higher plants, in algae, bryophytes there is no vascular tissue present and they lack seeds as well however, they all are autotrophic.

In gymnosperms, spermatophytes and angiosperms seed are produced and they also have vascular tissue. There is only Tracheophytes that have vascular tissue and seed are produced.  Fern is the tracheophyte that produces seedless vascular plants.

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b. the carbon cycle ensures living things have a source of hydrogen