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Fynjy0 [20]
3 years ago
13

Elizabeth is 90 years of age. compared to when she was 30 years of age, her _____ now. cells require more energy arteries are le

ss flexible stomach secretes more intrinsic factor skin is more elastic
Biology
1 answer:
Sav [38]3 years ago
7 0

The answer is ‘arteries are less flexible’. This is why the older you get the more predisposed you are to cardiovascular diseases such as high blood pressure. However, regular exercise may delay this development. The barometers in the blood vessels also become less sensitive hence these vessels become less responsive to blood pressure changes.






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True or false. Is sympatric speciation, a physical barrier arises and separates two populations l, ending flow between them
timofeeve [1]
<h3><u>Answer;</u></h3>

The above statement is <u>False </u>

<h3><u>Explanation;</u></h3>
  • Speciation is an evolutionary process in which new species arise. There are three types of speciation, namely; sympatric, parapatric and allopatric speciation.
  • <em><u>Sympatric speciation is a pattern in which speciation occurs in the absence of a physical barrier to gene flow; ex. polyploidy arising in flowers.</u></em>
  • In an Allopatric speciation on the other hand, a physical barrier arises and separates two populations, ending gene flow between them and allowing reproductive isolating mechanisms to evolve so that later if the two groups come back into contact they will no longer be able to reproduce together, therefore making them different species.
7 0
3 years ago
Read 2 more answers
In examining a cell using the electron microscope, you see a structure that is composed of two membranes, contains numerous pore
Effectus [21]
<h2>Nuclear Envelope</h2>

Explanation:

  • <em>The endomembrane system</em> includes the nuclear envelope, the <em>endoplasmic reticulum, Golgi mechanical assembly, lysosomes, vesicles, just as the plasma layer</em>
  • These cell parts cooperate to <em>alter, bundle, tag, and transport layer lipids and proteins </em>
  • The nuclear envelope is a double membrane, implying that there are <em>two lipid bilayers</em>
  • The nuclear lamina, a netlike cluster of <em>protein filaments, associates the layers of the nuclear envelope</em>
6 0
3 years ago
The density of water is:<br> 1.0 kg/L<br> 0.1 g/ml<br> 10 g/L<br> none of these
natulia [17]
The density of water is 1.0kg/L

5 0
3 years ago
A population of wild-flowers was scored for flower color. There were 302 blue (BB) plants, 1857 violet (BR) plants and 811 red (
Paul [167]

Answer:

frequency of the blue (B) allele = 0.4142

frequency of the red (R) allele = 0.5858

The number of blue plants expected is 509.652

The number of red plants expected is 1019.304

The anticipated number of violet plants is 1441.341

Calculated chi square value

= 84.5320 + 42.5688 + 119.8692\\= 246.97

Explanation:

Frequency of blue allele is

Frequency of blue allele is equal to sum of frequency of BB and half of frequency of BR

\frac{302}{2970} + \frac{1}{2} \frac{1857}{2970} \\= 0.1016 + 0.3126\\= 0.4142

Frequency of other allele

1- 0.4142\\= 0.5858

Chi Square test

See the attached file

The number of blue plants expected is 509.652

The number of red plants expected is 1019.304

The anticipated number of violet plants is 1441.341

Calculated chi square value

= 84.5320 + 42.5688 + 119.8692\\= 246.97

7 0
3 years ago
Which is a correct interpretation of the cladogram shown below?
nataly862011 [7]

A cladogram is an image or a diagram that shows us an evolutionary relationship between different organisms. Up at the top we find the different organisms and their names. Along the side is where we find their characteristics. Anything that is past each characteristic will have that characteristic as you move up the cladogram. This diagram also shows which organisms are most closely related to one another.



Please see the image for an example. In this example we can see that the Koalas evolved after the trout.



I hope this helps, Regards.

7 0
3 years ago
Read 2 more answers
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