Answer:
The main structural component of plant cell walls is cellulose which is a type of carbohydrate made up of a long chain of glucose molecules (a polysaccharide).
Explanation:
The plant cell walls are composed of cellulose, which is a structural carbohydrate made up of a long chain of glucose molecules (β linked D-glucose units). It is a polysaccharide like starch, but the starch molecule is flexible and the cellulose molecule is rigid. Each of these polysaccharide chains is connected together by hydrogen bonds. Microfibrils are formed by arranging some of these polysaccharide chains in parallel arrays. Due to the presence of hydrogen bonds, the microfibrils are extremely tough and inflexible. This property of cellulose provides strength and rigidity to the plant cell walls.
Answer:
The major disadvantage of coal is its negative impact on the environment. Coal-burning energy plants are a major source of air pollution and greenhouse gas emissions. In addition to carbon monoxide and heavy metals like mercury, the use of coal releases sulfur dioxide, a harmful substance linked to acid rain.
Explanation:
A. by building highways, railways, and airports
C.by providing power and Internet connections
D.by importing or developing innovative technologies
Physical capital applies to circumstances of production that subsist in a material way and could participate in the improvement of the effectiveness of commercial operation which is conducted out by the nation. Although the development of substantial training and the enhancement of food nutrition could be deemed as an expenditure, However, it does not directly involve in the expansion of the physical capital.
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❖ The correct answer choice is B. They share a common ancestor.
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Nitrogen and Iron
Dissolved nutrients is one of the most important property of sea water and has a huge effect in life in the ocean. The most critical is nitrogen among the nutrients. This plays a major role in the stimulation of the primary production by the planktons in the ocean. This can be considered as limiting because most marine life cannot live without this nutrients. Nutrients in the ocean are cycled to keep the balance known as biological pumping.
