Radial symmetry
Irregular galaxies show no distinct feature or symmetry.
SYMMETRY
name one anatomical feature (other than symmetry) that distinguishes a planarian from a hydra.
They are all soft-bodied.
Proportion
Gill supports
Proportion is attained when a painting has both balance and symmetry among different parts of the work.
No, arthropods are not radial. They have bilateral symmetry, which means their bodies can be divided into two equal halves. This symmetry is a common feature among many animals, including vertebrates and invertebrates.
Halo Combat Evolved was the first game to feature the Flood. They are first encountered in the level 343 Guilty Spark.
Spikes are a protective feature that has evolved over time to save them from predators.
Echolocation in bats is a feature that evolved only within the order Chiroptera. This ability allows bats to navigate and locate prey using sound waves they emit and receive.
It's homoplasy.