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:
Carbo dioxide, water and sun's energy comes fron the outside.... energy and Oxygen molecule are produced
Plants stomata allow it to transpire and is also a mechanism used to 'suction' or 'pull' the water through the xylem
