Comprehension Passage

Read the passage and answer the following questions.

We truly cannot understand the real worth of the environment. But we can estimate some of its importance that can help us understand its importance. It plays a vital role in keeping living things healthy in the environment. Likewise, it maintains the ecological balance that will keep the check of life on earth. Moreover, the entire life support of humans depends wholly on the environmental factors. In addition, it also helps in maintaining various life cycles on earth. Most importantly, our environment is the source of natural beauty and is necessary for maintaining physical and mental health.
 
The environment gives us countless benefits that we can’t repay our entire life. As they are connected with the forest, trees, animals, water, and air. The forest and trees filter the air and absorb harmful gases. Plants purify water, reduce the chances of flood maintain a natural balance, and many others. Moreover, the environment keeps a close check on the environment and its functioning. Besides, it maintains the culture and quality of life on earth. The environment regulates various natural cycles that happen daily. These cycles help in maintaining the natural balance between living things and the environment. Disturbance of these things can ultimately affect the life cycle of humans and other living beings. 
 
The environment provides us with fertile land, water, air, livestock, and many essential things for survival. Human activities are the major cause of environmental degradation because most of the activities humans do harm the environment in some way. The activities of humans that cause environmental degradation are pollution, defective environmental policies, chemicals, greenhouse gases, global warming, ozone depletion, etc. All these affect the environment badly. Besides these the overuse of natural resources will create a situation in the future there will be no resources for consumption. And the most basic necessity of living air will get so polluted that humans have to use bottled oxygen for breathing. Above all, increasing human activity is exerting more pressure on the surface of the earth which is causing many disasters in an unnatural form. Also, we are using natural resources at a pace that within a few years they will vanish from the earth. 
 
To conclude, we can say that it is the environment that is keeping us alive. Without the blanket of the environment, we won’t be able to survive. Moreover, the environment’s contribution to life cannot be repaid. Besides, what the environment has done for us, in return we only have damaged and degraded it.

According to the passage, the word 'countless' refers to -

1
a small number.
2
the minority of people.
3
a short time or distance.
4
small in size, amount, or degree.
5
too many to be counted.

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