The appendix, which is not needed in humans to survive, is considered to be a ...

homologous structure

vestigial structure

homology

Option 4

How does secondary succession differ from primary succession?

Which statements about a food chain are true? choose all answers that are correct. a.plants are the first living organisms in food chains on land. b. the plants in a food chain are called herbivores. c. all food chains on land begin with energy from the sun. d. carnivores in a food chain eat only plants.

Consider this microscopic image of bacteria, which bacterial form is shown in the image?