What genetic disorder causes the body to produce unusually thick mucus in the lungs and intestines

This is one of the five kingdoms in the older biological succession. organisms in this kingdom are prokaryotic

The phylogenetic tree illustrates the relationship between humans and our closest living relatives. the tree was based on biochemical comparisons, including dna and amino acid sequences. according to the biomolecular data, we could infer that

Is there any species that went extinct in recent years due to natural causes (not caused by human interaction). if so, what caused it?