Across-section of a tree trunk shows 20 dark-colored rings and 20 light-colored rings. what is the likely age of this tree?

Organisms are classified, or grouped into categories, based on similarities in their characteristics and/or evolutionary relationships. the study of how organisms are classified is known as

Drag each label to the correct location. each label can be moved more than once match the properties with the subatomic particle

The image shows the evolution of a species of fish. a few fish from a population developed different social behaviors and evolved into different species. two fish according to the image, the fish underwent . the new species of fish had mating seasons that were different from that of the original fish. because of the differences in mating seasons, the fish underwent reproductive isolation. this mode of isolation would be .