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Dvinal [7]
2 years ago
11

When salt is mixed with water and stirred, the salt will dissolve, forming a solution. When sand is mixed with water, the sand w

ill not dissolve. Why will salt form a solution with water but sand will not?
A) Salt is pulled apart into two ions by the polar water molecules, and sand is not.

B) Sand forms complex crystals which dissolve much more slowly than non-crystalline salt.

C) Salt consists of only 2 atoms and is small enough to dissolve, while sand is too large.

D) Sand is much harder than salt and so it will not form a solution with water.
Biology
1 answer:
babymother [125]2 years ago
3 0

The correct answer is A) Salt is pulled apart into two ions by the polar water molecules, and sand is not.

This happens because salt has both positive and negative ends that are attracted by the polar molecules of water.


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which techniques have farmers used for centuries to produce animals more suitable to their needs? A.genetic engineering B.select
s2008m [1.1K]

Answer:

B

Explanation:

This involves selectively breeding two or more populations of a species or subspecies with desirable traits that are wanted by the humans. The offspring of the populations will bear the desired traits from the population. Breeding can be done over generations. An example is the breeding a cattle population that is resistant to drought and another that produces more milk. The filial generations will bear both traits.

7 0
3 years ago
How is it possible that over 20 million living organisms on the planet are made up of only 5 types of nucleotide based arranged
almond37 [142]

Answer/Explanation:

The DNA in all living organisms is made up of 4 bases, adenine, thymine, guanine, cytosine. The RNA replaces thymine with uracil, making 5 types of nucleotide. The number of nucleotide pairs in a genome can range from half a million up to 100,000 million - meaning there are an exponential number of combinations of these 4 bases.

Imagine an organism exists that has only 2 nucleotides (<u><em>this is over 200,000x smaller than even the smallest bacterial genome</em></u>). If we allow any nucleotide at each of the 2 positions, then we have 4x4 (4²) or 16 possible combinations of sequences. For a nucleotide length of 4, the total number of possible combinations are 4⁴ or 256.

Since we are dealing with many millions of nucleotides, there are essentially infinite combinations of nucleotides, giving rise to the variation that produces over 20 million organisms on the planet.

3 0
3 years ago
In your opinion, is the nuclear membrane part of the endomembrane system? Why or why not? Defend your answer.
ipn [44]

Answer:

The correct answer will be- true.

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This system comprises of the nuclear membrane also as the outer nuclear membrane is continuous with the endoplasmic reticulum (organelle) directly and helps the synthesis and modification of the proteins and lipids. other organelles are the Golgi apparatus, vesicles, lysosomes and endosomes.

Thus, option-true is the correct answer.

6 0
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6 0
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The point at which the toxin would interrupt normal cell signalling in the pathway is the signal amplification. 
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