Answer:
Option (3)
Explanation:
In astronomy, the redshift refers to the shifting of the beam (spectrum) of light towards the light of higher wavelength. The red coloured light has the highest wavelength. This shifting of light is due to the doppler effect, which states that the wavelength of light changes when the light source and the observer are constantly in motion with respect to each other.
Based on this observation and many other scientific investigations, the scientists have concluded that the redshift data indicates the expansion of the universe, where the distant galaxies are moving constantly and rapidly away from us.
Thus, the correct answer is option (3).
Both cell wall and cell membrane are important parts of the cell, although they each have unique properties and purposes.
Cell membrane:
Cell wall:
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A cell membrane, seen in plant and animal cells, is selectively permeable and made of a phospholipid bilayer.
The cell membrane and cell wall control what enters and leaves the cell.
The cell wall is seen in a plant cell, gives shape to the cell, and stores carbohydrates.
The cell wall is selectively permeable and made of cellulose, which causes plants to have a rigid structure.
Particles in warm temperature rise while the particles in cooler temperature sink:
Temperature is a calculation of the mean kinetic energy of a substance's atoms or molecules. Heat is the transition of energy from a material at higher to a material at lower temperature. When heat is provided, the particles in liquids and gases acquire kinetic energy, which increases vibration and start moving faster.
Thus as the particles travel farther apart, they take up more space, due to which particles in warm temperature rises, as it allows the liquid or gas to move upward. While cooler liquid or gas travel downward because no external energy is provided to them, thus on acquiring low temperature, the inter-molecular forces between particles increase which deduct spaces between them.
Answer:
The correct answer or fill in would be- but Change and evolve over time.
Explanation:
The perfect cosmological principle is a extended version of the cosmological principle. The perfect cosmological principle says that the universe is look same from all directions but can be change and evolve with time.
Steady state theory supports this theory as it also says that universe is expanding but also maintain its density even though it continuously creates stars and galaxies but still look same.
Thus, the correct answer is -but Change and evolve over time.