What is the leading cause of water contamination in countries without water treatment plants?

Answer:

Transport

Explanation:

Living organisms are characterized by essential day-to-day activities which they undergo to sustain their life. One of these life processes is called TRANSPORT, which involves the circulation and absorption of nutrients.

Transportation is a life process where substances synthesized or absorbed in one part of the body are carried to other parts of the body. This life process is important in plant and animals as it leads to movement of nutrient, water, mineral, gases etc. In humans, circulatory system is responsible for this process of transportation.

A genus is subdivided into smaller groups called species. Therefore, option (B) is correct.

What is taxonomical classification?

Taxonomy is the study and practice of categorizing or classifying. A taxonomy (or taxonomical classification) is a categorization scheme, especially a hierarchical classification, that organizes things into groups or kinds.

There are seven primary taxonomic ranks: kingdom, phylum, class, order, family, genus, and species. In addition, domain, which was proposed by Carl Woese, is now commonly used as a fundamental rank, although not being listed in any of the nomenclature laws, and is synonymous with dominion.

A genus is a taxonomic rank composed of species grouped based on shared features (having similar structures or dissimilar characteristics) or evolutionary relationship. It is one of the eight major taxonomic ranks used to classify living organisms. It is subordinate to the family and superior to the species.

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It considered that all terrestrial plant species that exist today have evolved from Rhyniophyta (a type of spore plants, compiled by the most primitive forms of vascular). Now terrestrial plants presents by the Moss family, psilotaceae, lycopsids, class of the Horsetail, fern, gymnosperms and flowering plants.  Based on the cladogram, It assumed that the ancestors of all existing plants are algae, particularly green.

Glycogen provides long-term energy storage.

Glycogen is an example of a carbohydrate which is a polysaccharide that acts as a long-term energy storage compound in animals.

Further Explanation

• Living organisms require energy in order to undertake their daily activities such as growth and development, locomotion, gaseous exchange, etc. To do so they obtain nutrients for short-term and long-term energy source.
• Carbohydrates are the major energy source for living organisms, however, living organisms may use other sources of energy such as proteins or fats when carbohydrates is out of stock or not available.  

Energy source in animals

• Animals use simple carbohydrates such as glucose obtained from diet for short-term energy sources.
• These simple carbohydrates may also be stored for future use in the form of glycogen, which makes glycogen a long-term energy source, to be used when need arises.
• When glucose levels are low in the body hormones in the body trigger the breakdown of glycogen to glucose.
• Other sources of energy such as proteins and fats are used when carbohydrates storage is depleted, for example during starvation.

Energy source in plants

• In plants, on the other hand, simple carbohydrates are similarly used as a short term source of energy. Additionally, simple molecules such as glucose are stored in the form of starch for long-term source of energy for the plants.  

Why other Choices are incorrect:

Glucagon  

• Glucagon is the hormone that increases the blood glucose level to avoid it from dropping below optimum level.
• The hormone acts on the liver to stimulate the breakdown of glycogen to glucose, a process called glycogenolysis, and the glucose is released to the blood stream.

Glucose

• Glucose is a simple carbohydrate classified as monosaccharides. It acts as the short term source of energy in both plants and animals.
• It is readily broken down during the process of cellular respiration to yield energy in the form of ATP, which is then used to drive cellular processes.

Cellulose

• Cellulose is an example of a complex carbohydrates known as polysaccharides.
• It is found in plants cells lining the cell wall of all plant cells which is one of the key distinguishing feature between plant cells and animal cells.

Keywords: Glycogen, Glucose, energy sources  

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• Glycogen: brainly.com/question/6359375
• Role of glucose: brainly.com/question/2924762

Level: High school

Subject: Biology  

Topic: Cellular respiration

Glycogen serves as a long-term energy storage molecule in animals, including humans. Therefore option A is correct.

It is a complex carbohydrate made up of glucose units linked together in a branched structure. When dietary glucose levels are high, excess glucose is converted into glycogen and stored primarily in the liver and muscles.

This stored glycogen can be broken down into glucose when energy is needed during periods of fasting, exercise, or other metabolic demands.

Glucose, on the other hand, is a simple sugar that serves as an immediate energy source, while glucagon is a hormone involved in regulating blood glucose levels. Cellulose, a structural polysaccharide, is not used for energy storage in animals.

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