It requires energy & It involves the help of carrier proteins
Answer:
The Sun is the middle and is a source of heat
Answer: The call it the Inner Core
Explanation: Earth has 4 layers the Inner Core, the mantle, the outer core and the crust.
The crust- it is the surface of the Earth
The Mantle- Down below the crust is the Mantle
The outer core- known to protect the inner core
The inner core- also known as the center of the Earth
Answer:
A <u>scientific theory</u> is a well-substantiated explanation of some aspect of the natural world, based on a body of facts that have been repeatedly confirmed through observation and experiment. Such fact-supported theories are not "guesses" but reliable accounts of the real world.
Explanation:
Evolutionary theory, atomic theory, gravity, quantum theory, and plate tectonics are examples of this sort of over-arching theory. These theories have been broadly supported by multiple lines of evidence and help frame our understanding of the world around us.
Answer:
B. The diffusion of oxygen into the cells
Explanation: