What kinds of data do scientists use to construct phylogenetic trees (or cladograms, which can be used to construct phylogenetic trees)?

The phylogenetic tree shows the inferred evolutionary relationships among various biological species or other entities.

To build a phylogenetic trees or cladograms, which can be used to construct phylogentic trees scientists  collect data about the characters of each organism they are interested in. These data include physical characteristics (morphology), genetic sequences, and behavioral traits.

clinically, some people often have repeated allergies, eczema and respiratory infections or other parts of the infection, in this case, in addition to some routine tests such as tests for white blood cells, immunoglobulin series, lymphocyte subsets, etc., the five immune immunoglobulin tests are also necessary.

the supermassive black hole is in the middle of the galaxy.