by the way they look and act
their genome
The chart is a dichotomous key. It helps them classify things.
Scientists classify organisms by the dichotomous key. They classify by looking at if it moves or not, then they look at characteristics, then they can see what they are.
Radial symmetry
Scientists use morphological evidence, which includes physical characteristics like body shape and structure, and molecular evidence, which involves analyzing DNA or proteins, to classify organisms systematically.
DNA is the answer.
scientists classify organisms into groups based on internal and external features.
Scientists use the periodic table to classify the elements. The elements are arranged in the table based on their atomic number, electron configuration, and chemical properties. This organization helps scientists identify patterns and relationships among the elements.
Scientists use color, size, brightness, and temperature to classify stars.
I believe this is called magnitude, or apparent magnitude.
Taxonomy
One of the features is Taxomamy. Two is something. Three is something. Four is something. Five is something.