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ankoles [38]
3 years ago
6

If the ancestral form for a particular lineage was aquatic and used gills for respiration, what changes would you expect to see

in a terrestrial descendant?
Biology
1 answer:
Marat540 [252]3 years ago
4 0
<h2>The Respiration of Gills</h2>

Explanation:

  • A dominant part of aquatic animals like fish and prawns inhale through uncommon organs called gills.
  • The skin that help in utilizing oxygen broke up in water. which help in return of gases and Gills contain veins.
  • Amphibian life forms have a unique organ called gills, which permits them to inhale oxygen in the water.
  • The two sides of the pharynx (throat) by the Gills when the gases exchange in fish .
  • <em>Gills are tissues that resemble short strings, protein structures called fibers. </em>
  • These fibers have numerous capacities including the exchange of particles and water, just as the trading of <em>oxygen, carbon dioxide, acids and alkali.</em>
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Analysis of the second swab has confirmed that the causative organism is Streptococcus pyogenes, a gram-positive organism. Imagi
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<u>Answer:</u>

<u>D. purple, spherical-shaped organisms arranged in chainlike formation</u>

<u>Explanation:</u>

Streptococcus pyogenes is a gram positive coccus. Coccus implies that it has  a spherical shape.

Gram positive organisms like streptococcus pyogenes take up purple stain on gram staining whereas gram negative organisms like E. coli take up pink stain on gram staining.

Further more, streptococcus pyogenes is arranged in chains or pairs. Unlike staphylococcus which is arranged in clusters.

Coming back to answer choices,

<u>A. pink, rod-shaped organisms arranged in pairs</u>

It is the incorrect choice as Streptococcus pyogenes is gram positive and they appear blue on gram staining.

<u>B. purple, spherical-shaped organisms arranged in grapelike clusters</u>

This is the incorrect choice. Although Streptococcus pyogenes appears blue on gram staining but it is arranged in chains like a beaded necklace. Purple, spherical-shaped organisms arranged in grape-like clusters is typical appearance of Staphylococcus.

<u>C. pink, spherical-shaped organisms arranged in chainlike formations</u>

It is incorrect as Streptococcus pyogenes appears blue on gram staining as it is gram positive.

<u>D. purple, spherical-shaped organisms arranged in chainlike formation</u>

This is the correct choice and describes typical appearance of Streptococcus pyogenes.

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