Citizen scientists have helped researchers solve a long-standing mystery about how parental care evolved in harvestmen。 Using photos and observations from iNaturalist, scientists more than doubled the known cases of egg-guarding behavior and discovered that maternal and paternal care followed different evolutionary paths。 The project, completed in
Why do beaches today have seashells from clams and snails instead of brachiopods。 A new study suggests the answer lies in Earth's greatest mass extinction, when warming oceans and falling oxygen levels wiped out animals that couldn't adapt。 Species with body plans and metabolisms better suited to the changing conditions survived and went on to domi