Ciggaretes contain various carcinogenic(cancer-causing) substances,among them tar.Tar affects the DNA of the lung cells,causing spontaneous changes in their genetic make-up(mutations).The mutations cause lung cancer.
Chiry answered the question on November 7, 2017 at 17:50
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What are the adaptations of the xylem vessels in the transportation of water in a plant?
(Solved)
What are the adaptations of the xylem vessels in the transportation of water in a plant?
Date posted:
November 7, 2017
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Answers (1)
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With suitable examples, distinguish between homologous and analogous structures.
(Solved)
With suitable examples, distinguish between homologous and analogous structures
Date posted:
November 7, 2017
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Answers (1)
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State and explain any five evidences of organic evolution
(Solved)
State and explain any five evidences of organic evolution.
Date posted:
November 7, 2017
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Answers (1)
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Describe how a male reproductive system is adapted to its functions.
(Solved)
This is an essay on human male reproductive system.
Date posted:
November 7, 2017
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Answers (1)
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List four forms of diabetes mellitus
(Solved)
List four forms of diabetes mellitus
Date posted:
November 4, 2017
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Answers (1)
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Explain how structural features in terrestrial plants affect their rate of transpiration
(Solved)
Explain how structural features in terrestrial plants affect their rate of transpiration
Date posted:
November 4, 2017
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Answers (1)
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Outline the characteristics of meristematic tissue
(Solved)
Outline the characteristics of meristematic tissue
Date posted:
November 3, 2017
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Answers (1)
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Explain what happens to a young growing seedling when exposed to unidirectional source of light
(Solved)
Explain what happens to a young growing seedling when exposed to unidirectional source of light
Date posted:
November 3, 2017
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Answers (1)
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List three types of muscles
(Solved)
List three types of muscles
Date posted:
November 3, 2017
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Answers (1)
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Explain why individual with smaller sizes require more energy per kg of body weight than those with large sizes
(Solved)
Explain why individual with smaller sizes require more energy per kg of body weight than those with large sizes
Date posted:
November 3, 2017
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Answers (1)
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Identify the type of mutation represented by the following pairs of words
Shirt instead of skirt
Hoping instead of shopping
Eating instead of tea
(Solved)
Identify the type of mutation represented by the following pairs of words
Shirt instead of skirt
Hoping instead of shopping
Eating instead of tea
Date posted:
November 3, 2017
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Answers (1)
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State three functions of the mammalian blood other than transport
(Solved)
State three functions of the mammalian blood other than transport
Date posted:
November 2, 2017
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Answers (1)
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State the role of juvenile hormone in the development of insects
(Solved)
State the role of juvenile hormone in the development of insects
Date posted:
November 2, 2017
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Answers (1)
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Name the hormone responsible for moulting in insects
(Solved)
Name the hormone responsible for moulting in insects
Date posted:
November 2, 2017
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Answers (1)
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List any distinguishing features of the class arachnida
(Solved)
List any distinguishing features of the class arachnida
Date posted:
November 2, 2017
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Answers (1)
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State the functions of the following cell organelle (i) Ribosome (ii) Smooth endoplasmic reticulum (iii) Golgi apparatus
(Solved)
State the functions of the following cell organelle
(i) Ribosome
(ii) Smooth endoplasmic reticulum
(iii) Golgi apparatus
Date posted:
November 2, 2017
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Answers (1)
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Give reasons as to why blood clotting is important.
(Solved)
Give reasons as to why blood clotting is important.
Date posted:
October 31, 2017
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Answers (1)
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Describe how the leaves of green plants are adapted to their photosynthetic functions.
(Solved)
Describe how the leaves of green plants are adapted to their photosynthetic functions.
Date posted:
October 31, 2017
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Answers (1)
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What are the two major branches of biology?
(Solved)
What are the two major branches of biology?
Date posted:
October 30, 2017
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Answers (1)
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Explain how the internal and external structure of a mesophyte leaf is adapted to photosynthesis.
(Solved)
Explain how the internal and external structure of a mesophyte leaf is adapted to photosynthesis.
Date posted:
October 27, 2017
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Answers (1)