Question

Organisms that lack chlorophyll and consist of reproductive spores and threadlike fibers are ____.​

Answer 1

The answer is fungi

Fungi or fungus is a group of eukaryotic organism. Fungi member is mostly known as the mushroom.
It is a heterotroph so it won't have chlorophyll. The reproductive organ of fungi would be spore. It cells will be grown into a long threadlike fiber called hyphae.