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:
B.) crystallization. Igneous rocks turn into sediments through the process of crystallization.
A.) ethical is a concern raised
Water and ATP energy
where carbon dioxide is a waste product and is released into the atmosphere.