Fill in the blanks to complete each statement about the age of Earth. According to scientific evidence, Earth is approximately 4.6 billion years old. Scientists used fossils and rocks dating to determine Earth’s age.

Sweating and breathing is an example of differentiation specialization maintaining homeostasis metabolism

Ais a landform that is formed at the mouth of a river from the deposition of sediment carried by the river as the water flows.

The image below shows a common blood pressure gauge. what does this device do? a. measures the level of oxygen present in the blood b. measures the pressure of blood when the lungs expand and compress c. measures the electrical activity of the heart d. measures the pressure of blood when the heart contracts and relaxes