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Ipatiy [6.2K]
3 years ago
8

Please help with all three

Biology
1 answer:
ss7ja [257]3 years ago
8 0
Q6: A
Q7:D
Q8:C

Reasoning
Q6: Based on all the other questions talking about common ancestors I deduced that to find a “common” ancestor they need to find things that are the same.

Q7: All arthropod have a exo skeleton for example a lobster or crab. They all have a head, abdomen and thorax for example ants. They all have legs with joints for example a spider.

Q7:So bones are traveled down by ancestors so the types of bones stay the same but natural selection has changed them to better fit their environment.
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When the polymerase chain reaction (PCR) is used to amplify segments of DNA, the sample is first heated, and then cooled, in cyc
baherus [9]

Answer:

At least 17 PCR cycles or 16 PCR cycles

Explanation:

As we know -

In one chain of  heating and cooling  of polymerase chain reaction (PCR), the strands of DNA gets doubled.

The general mathematical representation of this is

{2^n - (2 *  n)}

where "n" is the number of PCR cycles.

It is given that DNA strands  to be produced is 16 times the original quantity of DNA.

So the PCR cycle must be carried out at least 17 times in order to have DNA strand not less  than 16 times the original quantity of DNA

8 0
3 years ago
Which step is part of the formation of a batholith? Heat and pressure change a pluton into metamorphic rock. A single pluton enl
Paha777 [63]

The step that is part in the formation of the batholiths is a single pluton enlarges into a huge mass by melting the rock around it. A single pluton does not enlarge into a huge mass, instead, it will melt due to the buoyant magma that surrounds it.

4 0
3 years ago
Read 2 more answers
How does an atom become a positive ion?
solong [7]

An atom that gains a negative electron, it becomes a negative ion. If it loses an electron it becomes a positive ion. Some atoms lose electrons and become positive ions. Others gain electrons and become negative ions.

6 0
3 years ago
Read 2 more answers
Beyonce and Jay Z want Blue Ivy to have a sibling. However, Beyonce is worried because Jay Z has a unibrow (a dominant trait). S
weeeeeb [17]

The trait that is dominant or reccessive can be obtained by the use of a Punnet square or by the use of the conventional crossing of allele pairs.

<h3>What are traits?</h3>

The term traits refers to the expressed characteristics of an organism. The dominant trait is expressed while the reccessive trait is not expressed.

The trait that is dominant or reccessive can be obtained by the use of a Punnet square or by the use of the conventional crossing of allele pairs.

Learn more about traits:brainly.com/question/7602134

#SPJ1

4 0
2 years ago
The rocky material left behind by a retreating glacier forms what is called a moraine. When primary succession occurs on a morai
nexus9112 [7]

Answer:

The correct answer is - B. Lichens.

Explanation:

Lichens are one of the pioneer species that can grow on bare rock such as moraine and help make soil for further ecological succession and making ground for other species.

Breaking the bare rocks to convert into the soil is part of the primary succession. Lichens are colonized over these rocks and they contain acid which leads to the breakdown of the moraine and other rocks.

5 0
3 years ago
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