Answer:
In studying the origin of the universe, one of the primary unanswered questions is <u>what came before the big bang.</u>
Explanation:
The big bang theory can be described as a theory which scientists have proposed to explain how the universe came into existence. This theory predicts how the extremely hot temperatures and dense atmosphere might have given rise to the stars and the galaxies.
Scientists have no idea what happened before the big bang theory. Some scientists predict that there might be another universe which collapsed before the big bang theory. While other scientists claim that there was nothing before the big bang.
Answer:The four main divisions of gymnosperms are Coniferophyta, Cycadophyta, Ginkgophyta, and Gnetophyta. Gymnosperms are often found in temperate forest and boreal forest biomes. Common types of gymnosperms are conifers, cycads, ginkgoes, and gnetophytes.
Explanation:
True
Explanation:
The ocean conveyor belt explains the cyclic nature of global water round the globe.
It suggests that cold denser water circulates and moves downward whereas warm water rises.
- The great ocean conveyor belt shows that the world's ocean is constantly circulating and mixing.
- At high latitude where temperature is low, warm water from around the equator where the sun is over head loses heat to warm the atmosphere.
- As they lose heat, they become colder and denser.
- They then sink and begin to flow southward where they get heated and rise.
- This conveyor belt is driven by salinity and temperature differences.
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Both chordates and invertebrates have pharyngeal pouches
