Coal is a basic source of chemical energy . Wood is also a source of chemical energy . Even there are more many sources like gasoline,photosynthesis
Answer: By studying the migratory behavior of the birds.
Explanation:
Evolution is the change in the characteristics of the species with due course of time and from generation to generation. Study of the control mechanism of the bird migration and their evolution also accounts for the evolutionary aspect of the migratory birds and their behavior. It was influenced with the Model of control mechanism.
Answer:
the answer is (A) a powerhouse
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In the case of chronic bronchitis or chronic inflammation of the airways, cyanosis or the bluish discoloration of the skin results from the reduced levels of oxygen in the blood. With reduced oxygen levels, the blood in the arteries will not be bright red in color but rather be brownish just like venous blood and this reflects in the skin as bluish in color.
B..................................