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Anna [14]
3 years ago
12

Structures that appear to have no function for the organism but probably had a function in an ancestral organism?

Biology
1 answer:
navik [9.2K]3 years ago
8 0
I believe these types of structures are called vestigial structures. Vestigial structures are body parts that seemingly have no purpose or function in the current form of an organism of the given species. Examples of such structures in human include; the muscles of the ear, the appendix, the tail bone, body hair, wisdom teeth among others. These structures are often homologous to structure that are functioning normally in other species and for this reason they can be considered evidence for evolution.
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Study the diagram of a cell. Which structure is found only in plant cells and functions in the process of photosynthesis
Ede4ka [16]

Answer: Chloroplasts

Explanation:

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4 years ago
Compare and contrast the advantages and disadvantages of wind power and geothermal power
aliina [53]

Answer:

An Overview of Geothermal Pros and Cons:

Pros Cons

This energy source is more environmentally friendly than conventional fuel sources.  The largest single disadvantage of geothermal energy is that it is location specific.

A source of renewable energy.  Gases are released into the atmosphere during digging.

The number of exploitable geothermal resources will increase with ongoing research and development in the industry.  Geothermal energy runs the risk of triggering earthquakes.

A sustainable source of energy as its always available unlike wind and solar.  Expensive resource to tap into, with high upfront costs ranging from around $2-$7 million for a plant with a 1 megawatt capacity.

A reliable source as its easier to predict the power output from a geothermal plant with a high degree of accuracy.  Energy fluid needs to be pumped back into the underground reservoirs faster than it is depleted. Management is required to maintain sustainability.

No fuel is required.  

Increase in exploration meaning that new technologies are being created to improve the energy process.  

Pollution levels are much lower compared to fossil fuels.

Explanation:

8 0
3 years ago
26. In pea plants, purple flowers are dominant to white. Cross a heterozygous flower with a white flower. (You definitely should
Misha Larkins [42]

Answer:

B) Phenotypic Ratio

Explanation:

Phenotype is the Visible expression of a Character

Also, with the help of a punet's square we will come to know to the Phenotypic Ratio is 3:1 where the purple flowers are dominant to white flowers where as if we take a Genotypic ration it doesn't show the Visible expression of a character, it only shows the genitical constituion of a character! If we take "percents", then it could be the Genotype "Percents" or Phenotype "Percents"

4 0
3 years ago
Which chemical disinfectant works by methylating enzymes and nucleic acids and is known for being toxic and carcinogenic?
kifflom [539]

Answer: Formaldehyde

Explanation:

The chemical agent that is carcinogenic in nature is Formaldehyde. It causes irritation in the living tissues and therefore should not be used as an antiseptic.

This can be used a chemical disinfectant which works by killing the harmful organisms by methylating enzymes and nucleic acid. This is toxic in nature and hence used as chemical disinfectant.

3 0
4 years ago
The __________ abuts the lumen of the alimentary canal and consists of epithelium
Misha Larkins [42]

Question is incomplete. Complete question is as follows:

The ____ abuts the lumen of the alimentary canal and consists of epithelium, lamina propria, and muscularis mucosae.

Answer:

Mucosa

Explanation:

Mucosa or mucosal membrane forms the lining of many cavities in the body like the alimentary canal and also covers many internal organs. It lines reproductive, digestive and respiratory system. In the gastrointestinal tract the mucosa is made of three layers: epithelium, lamina propria and muscularis mucosae.

The epithelium of mucosa is made of simple columnar epithelium cells. It consists of many types of cells like parietal cells (secrete HCL) and foveolar cells (secrete mucus). Lamina propria is a loose connective tissue present beneath the epithelium. It provides nutrition and support to epithelium. Muscularis mucosae has smooth muscle fibers which helps the glands on the surface to secrete their contents and also increase the contact between contents of lumen and epithelium.

5 0
3 years ago
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