The answer is: A decrease in the number of Trees
Woodpeckers are known for their use of finding food sources on the trucks of trees. They are also popularly own for beating their beaks against a tree trunk in order to provide vibrations and communicate with other woodpeckers.
Contrary to popular belief, they do not eat wood, but trees as a whole form an important part of their habitat.
Hence, the deforestation, cutting down of trees and urbanization can all lead to the decreasing number of woodpeckers in the ecosystem.
Since the early 20th Century two species of American woodpeckers are already considered extinct.
Answer:
The evolution of the organisms can be explained on the different evidences like biochemical evidence, molecular evidence, morphological evidence and fossil evidence.
The fossil evidence indicates the direct evidence of the evolution. The feather present in the dinosaurs is used as the insulation that provide the heat to the birds. Later on the crowding on the land forms leads to the adaptation of the flight in the dinosaurs.
Muscle cramps are caused when the muscle takes longer than normal to relax after a contraction. During contraction, the myosin heads attach on their binding sites on the actin filament and pulls on the filament hence shortening the sarcomeres. For the myosin head to release its binding site on the actin filament, ATP attaches to an active site on the myosin and is hydrolyzed to ADP and Pi. This causes relaxation after a contraction cycle. Cramps, therefore, may be due to depletion of ATP molecule in the muscles cells.
Another reason for cramps may be a high amount of calcium in the muscles that bind to troponin on the actin filaments. This exposes the myosin binding sites longer hence promotes the formation of cross-bridge even when the contraction of the muscle is not intended anymore.
First, the sun must evaporate water. This attaches to a condensation nuclei and condenses in the cloud. Condensation occurs when warm air masses cool quickly. The two necessary conditions are for the air to be moist and warm (primarily found in low pressure zones) and for there to be dust/ other condensation nuclei in the air
I would say that a bar graph will most helpful.<span>≧◡≦</span>
