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BartSMP [9]
3 years ago
15

A scientist claims to have found a fossil that is more than 6 billion years old. Why is the scientists claim false?

Biology
1 answer:
fomenos3 years ago
3 0

Answer:

C. The hot magma covering early earth would have destroyed fossils

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What water property allows water molecules to bond together?
RUDIKE [14]

Answer:

Water has an amazing ability to adhere (stick) to itself and to other substances. The property of cohesion describes the ability of water molecules to be attracted to other water molecules, which allows water to be a "sticky" liquid.

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3 years ago
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The model below shows a carbide ion.
andreyandreev [35.5K]

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add 2 electrons

Explanation:

Add 2 electrons to carbide atom make it neutral because there are two unpaired electrons present in the carbide atom and it has -2 charge. So the carbide required two electrons for pairing and make the carbide atom neutral.  for adding two electrons its all unpaired electrons paired to other two electrons which complete its valency and make it a stable atom.

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Elephants shape their environment in many ways. They can change a forest to a grassy field or dig a hole that might become a pon
Aleks [24]

Answer;

both positive and negative

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-The elephant are keystone species, playing an important role in maintaining the biodiversity of the ecosystems in which they live. They may have both negative and positive interactions to the environment. For example, during the dry season, elephants use their tusks to dig for water, which has a positive impact to the surrounding.

-They clear large amounts of vegetation, which removes habitats for some organisms but makes the area inviting for other organisms. This has both positive and negative impact to the ecosystem.

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3 years ago
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Describe how having dark skin may have provided an advantage in survival and reproduction to people thousands of years ago in so
Lemur [1.5K]

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Recent studies have shown that dark skin colour was developed in the past for protection against cancer. Scientists claim that in the past natural selection favoured humans having dark colour as compared to humans having a fair colour. This is because humans having a darker colour produced more melanin which protected them from ultraviolet radiation. As a result, this skin colour protected more against skin cancer. Hence, Having a darker skin colour protected in survival and reproduction to people thousands of years ago.

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Which of the following is NOT a membrane-disrupting toxin?
Vaselesa [24]

Answer:

Answer is A-B toxin.

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A membrane-disrupting toxin is toxin that affect the cell membrane. The effect of its secretion  could be by interrupting the phospholipid layer or through pores formation on the membrane.

Membrane- disrupting toxins are regarded as  exotoxins. Examples are leukocidin and hemolysin which their effects cause leakages of the cytoplasmic content and lysis of the cell, through the formation of pores on the cell membrane.

The A-B toxin are produced by the proteins of pathogenic organisms such as the bacteria. Example is botulinum toxin.

3 0
3 years ago
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