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34kurt
4 years ago
7

Tiny structures within the cell that perform a particular job are called

Biology
1 answer:
olya-2409 [2.1K]4 years ago
4 0
Organelles are found within the cells.
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Need an answer, please need an answer, please.<br>no copy on góogle​
DENIUS [597]

Answer:

hii there

i have worked on this but i have two answers so choosing is on you

Explanation:

Essay 1 )

In many people's opinions mans impact on the environment is a big issue in our life which is easily neglected, as humans are responsible for a staggering amount of damage on the earth. Nature manages its own components.

Since the outbreak of technology and industrialisation humans have greatly had a negative impact on the environment, such as; air pollution, habitat destruction, water pollution, the burning of rainforests and land pollution. In this essay I intend to give facts and discuss the effects and causes on these topics and discuss the solutions being carried out to improve the conditions.

Air pollution effects people in areas of emission sources, such as, power plants, local industry and major roads. Humans contribute to pollution by the use of machinery in industry causing pollution to the environment. More effects of air pollution on the environment involve using diesel fuel for vehicles and coal for power along with the lack of emission controls for vehicles and industry.

Another cause of air pollution is the greenhouse gas CO2, this gas warms the earth through living things as they emit CO2 when breathing which contributes to humans also, as we add to this statistic through breathing also. CO2 is usually thought to be involved with cars, aeroplanes and power plants, in the past 150 years , CO2 has been polluting our atmosphere through the sources mentioned, this is the highest CO2 emissions recorded for a long time. More causes of air pollution is methane gas which comes from swamps which are contributed to man through flooding. Cfc's are another major cause of air pollution by man through the use of fridges and deodorants (aerosols) which harms the earth's ozone layer.

Essay 2 )

In order to meet the basic needs of increases population, the present society has under taken a series of steps like rapid industrialization, unplanned urbanisation, deforestation, overexploitation of natural sources, etc.The outcomes of the above human activities have contributed significantly to the degradation of environment around us.

Some important impacts of human activities on environment are outlined below:

1. Deforestation:

In order to provide timber and farm land to increased population, large number of forest trees are cut and forest area is converting to farm lands. The rate of deforestation is so faster that around 1.5 million hectare of forest cover is lost every year is India alone. The process of deforestation results in decreasing rainfall, increasing global temperature, loss of top soil, modification of climatic conditions etc.

2. Industrialization:

Although the industrial activities of man provide basic need of the society, simultaneously the same release a lot of pollutants to the environment. The pollutants in environment cause loss of raw materials, health hazards, increase in death rate, damage to crop, making environment unfit for living organisms etc.

3. Loss of ecological balance:

The excessive use, misuse and mis-management of biosphere resources results in disturbance in ecosystem or ecological imbalance.

4. Air pollution:

The anthropogenic release of various air pollutants to the environment causes a number of dreaded phenomena like green house effect, ozone layer depletion, acid rain and smog formation etc.

5. Water pollution:

Human activities in respect of disposal of sewage wastes, solid wastes, municipal wastes, agricultural and industrial wastes cause the environment unfit for day to day use. Besides, polluted water spreads or leads to different diseases.

6. Increased consumption of natural resources:

Since the starting of industrial era, the natural resources are constantly utilised for the production of one or more products for the day to day use of society.

7. Production of waste:

Rapid industrialization and unplanned urbanization release a lot of toxic waste material either in solid or liquid or gaseous state which induces a number of serious environmental hazards.

8. Extinction of Wildlife:

Since forests are natural habitats of wild life (both plants and animals) deforestation leads to the extinction of valuable wild life and loss of biodiversity.

9. Habitual destruction:

The commercial and industrial activities associated with mining, construction of dams, fishing, agriculture etc. cause habitat destruction which is a pathway to pollution.

10. Noise pollution:

The man-made noise due to mechanized automobile, industries, trains, aero planes, social functions etc. causes noise pollution which has impact on both biotic and a biotic components of environment.

These are the human impacts on environment

hope it helps

have a nice day : )

8 0
3 years ago
Read 2 more answers
____ is a chronic condition in which acidic stomach contents leak into the esophagus, causing pain and damaging the esophagus.
adoni [48]

Answer:

<u>Gastroesophageal reflux</u> is a chronic condition in which acidic stomach contents leak into the esophagus, causing pain and damaging the esophagus.

Explanation:

The Esophagus is a part of the digestive tract, which communicates the pharynx with the stomach. Under normal conditions, the gastric or intestinal contents do not pass into the esophagus, since there is a lower esophageal sphincter (IAS) that acts as a valve and prevents the backflow of food. Gastroesophageal reflux (GERD) occurs when stomach contents are returned to the esophagus and causes heartburn (also known as gastric reflux), that is, it occurs when a muscle at the end of the esophagus does not close properly. This allows the stomach contents to return, or reflux, to the esophagus and irritate the mucosa and produce different symptoms and complications.

7 0
3 years ago
Judging from the information in the table, which of these stars is least likely to be categorized as a supergiant?
77julia77 [94]

Answer:

sun

Explanation:

4 0
4 years ago
Read 2 more answers
What is the function of valves in veins? what is the function of valves in veins? they counteract low venous pressure, and preve
ivann1987 [24]
<span>a. they counteract low venous pressure, and prevent backflow of blood away from the heart - Venous valves are structures that are made of elastic tissue. The valves are there to ensure that the blood keeps moving in one direction. The veins use these valves to work against  the effects of gravity as well as low pressure with the veins.
</span>

7 0
3 years ago
Sodium (Na) and potassium (K) are in the same group in the periodic table. Sodium is in the 11th position. How many valence elec
Rama09 [41]
Potassium is just below the sodium in periodic table in s group !

so the valence electron of sodium and potassium is same and that is 1 !
6 0
3 years ago
Read 2 more answers
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