The predominant hypothesis for why the animals needed some 3 billion years to evolve after the life first appeared on the planet is that the conditions were not right for them to appear.
The life on Earth has appeared much earlier that what we normally assume, and also it has not been evolving very quickly, but instead it has been a very slow and gradual process. The reason for that is that the living conditions on the Earth were much different than what are they now, or anytime from the Cambrian period until the present.
The surface was still pretty hot, and there was intense volcanic activity. The composition of the atmosphere was not suitable for animals to appear at all, and in fact it would have been toxic for them. The water too had chemicals in it that were not providing the right conditions for animals to evolve. It was only after the plants started to appear and managed to make lot of changes in the water, atmosphere, and land, than the animals were able to evolve and develop.
Answer:
it spanned between 66 million years ago and 56 milion years ago
Explanation:
I hope htis helped!
The lake on titan was evaporated, it evaporated because at that time titan was going through summer.
Phrenology is considered a pseudoscience because it lacks quality experiments. Since phrenology is the study of the brain by looking at the size and the shape of the skull, there is no biological proof through experiments.
Answer: it lacks qulality experiments
Credit to: @SociometricStar
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The GI tract consists of mouth, esophagus, stomach, small intestine, large intestine, and anus,
<h2>Pathway of digestion</h2>
The GI tract is a series of hollow organs that is joined in a long, twisting tube from mouth to the anus. The GI tract are the mouth, esophagus, stomach, small intestine, large intestine, and anus are the hollow organs while on the other hand, the liver, pancreas, and gallbladder are the solid organs of the digestive system.
The food enters through mouth which moves after chewing to esophagus then to the stomach. After digestion, all the nutrients are absorbed whereas waste materials are send to the small and then large intestine and finally to anus.
Learn more about digestion here: brainly.com/question/882651
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