Answer:
they have certain functions and or adaptations that allow them to move without spines
Explanation:
Answer:
I think that birds have different bill lengths because of their habitats and their diet. Also natural selection and evolution has also played a factor due to the fact that birds have not always looked the way that they do now, for example the Archaeopteryx a bird that lived around the time of the dinosaurs had a shorter and more powerful bill to grind insects and small mammals
Explanation:
Answer:
depended on applications of fertilizers, pesticides and irrigation to create conditions in which high-yielding modern varieties could thrive.
Explanation:
