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MaRussiya [10]
3 years ago
6

How are complementary strands of DNA held together?

Biology
2 answers:
Alekssandra [29.7K]3 years ago
6 0
The answer to this is a
MissTica3 years ago
5 0

with hydrogen bonds connecting cimilk6

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Describe the advantage of an excretory system for terrestrial animals
yaroslaw [1]
The excretory system allows animals to remove metabolic waste their bodies. Many of these substances are potentially toxic. in Mammals nitrogenous toxins like urea are expelled through liquid urine while in reptiles and birds the nitrogenous compounds are expelled as a solid. This allows birds and reptiles to use less water in the processes of metabolism.
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3 years ago
What happens when two related species attempt to use the same resources?
natulia [17]
A) One species always outcompetes the other until only one species remains.
4 0
3 years ago
7. (True Story) In Denmark, a husband and wife who had been unsuccessfully trying to have a
ratelena [41]

Answer:a

a possible explanation for this occurrence is that a test tube or dropper was accidentally used repeatedly without being sterilized, causing sample cross-contamination. DNA in this test case did not confirm that the father of the second child was another client of the fertility clinic who had never met the mother...therefore this is a possibility.

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4 0
2 years ago
Scientists have observed that pythons have vestigial leg bones. They have also observed that snakes in general have more DNA seq
hichkok12 [17]
The answer is <span>They both suggest that snakes evolved from an ancestor with legs.

The second choice is not correct since we have no information about pythons and other snakes. We only have the relationship between geckos, snakes and legless eels. So, it is said that </span><span>snakes in general have more DNA sequences in common with four-legged geckos than they do with legless eels. This means that snakes are closer to geckos than the legless eels. We cannot conclude from this information which evolved from which, but we can say that </span><span>snakes evolved from an ancestor with legs.
In different case, if the snakes had more DNA sequence in common with legless eels, we would conclude that the snakes evolved from an ancestor without legs.</span>
4 0
3 years ago
In which developmental stage are genetic malformations most likely to occur?
S_A_V [24]
<span>The answer would be: A) First trimester

</span>Genetic malformation should happen when the baby is forming its organs. Most of the organ is formed at the 3rd weeks of pregnancy which is part of the first trimester. If there is no malformation at this stage, it is less likely that any will develop at the later stage since it involve more growing and developing the current organ.
4 0
3 years ago
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