A useful model of the universe should explain two key observations: the movements of celestial bodies and the nature of the universe's composition, including elements like dark energy.
Two vital observations that a model of the universe needs to explain to be considered useful include the movement of celestial bodies and the nature of the universe's composition. For instance, as our knowledge grew, so did our understanding of the movement of celestial bodies. An early model imagined Earth as the center of the universe with everything else moving in circular orbits around it. However, these models had to be updated as more observations were made, leading to a sun-centered model fitting closer to the experimental evidence.
Secondly, the nature of the universe's composition is crucial. As hypotheses in astronomy evolve, our concept of the universe's makeup has grown to accept the idea of dark energy. While there's convincing evidence that dark energy makes up the bulk of the universe, scientists still seek a thorough understanding of what dark energy is in reality.
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(10 Points)
a. Warm air sinks at the equator, and cold air rises at the poles.
b. Warm air rises at the equator, and cold air sinks at the poles.
c. Warm air rises at the equator, and cold air rises at the poles.
d. Cold air rises at the equator, and warm air sinks at the poles.
Answer:These variations in air pressure are due to temperature differences caused by variations in solar energy received at the surface of the earth. The sunlight absorbed by the ground depends on the latitude of the location, the slope and the underlying surface. ... The air pressure on Earth is not the same everywhere.
Explanation: i looked it up
Answer:
Changes which occur after fertilisation is called post fertilisation.
1.ovary changes to fruit and wall of ovary changes to fruitwall
2.ovule changes to seed and ovule layer changes to seed coat
3.diploid zygote changes to diploid embryowhich develop into young plant
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Answer:
hi I'm an Indian girl ........