i asked him what he was doing there narration change​

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Explanation:

I asked him what he had been doing.

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আমি সমানুপাতের যোগ প্রক্রিয়া ও ভাগ প্রক্রিয়া দ্বারা প্রমাণ করি যে a:b::c: d হলে, (a+b)(ab)::(c+d):(c-d) হবে।​

Answer:

আমি সমানুপাতের যোগ প্রক্রিয়া ও ভাগ প্রক্রিয়া দ্বারা প্রমাণ করি যে a:b::c: d হলে, (a+b)(ab)::(c+d):(c-d) হবে।

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17. Define green chemistry. Write two disadvantages of nanotechnology.​

Green chemistry (sometimes referred to as sustainable chemistry) is the branch of chemistry that deals with the design and optimization of processes and products in order to lower, or remove altogether, the production and use of toxic substances.

Nanotechnology has raised the standard of living but at the same time, it has increased pollution which includes air pollution. The pollution caused by nanotechnology is known as nano pollution. This kind of pollution is very dangerous for living organisms.

They can also cause lung damage

one more defination green chemistry,

Green Chemistry is the use of chemistry for pollution prevention by an environmentally conscious design of chemical products and process that reduce or eliminate the use or generation of hazardous substances

consolidated the energy flowing ecosystem​

Answer:

Energy flow is the flow of energy through living things within an ecosystem. All living organisms can be organized into producers and consumers, and those producers and consumers can further be organized into a food chain. Each of the levels within the food chain is a trophic level.

explain the method of waste disposal in plant​

Answer:

Actually there is no specific excretory system in plants like us . Plants excrete exesss co2 through stomata. Other wastes are stored in different forms in different parts. The gums, oils, latex, resins, etc. are some waste products stored in plant parts like barks, stems, leaves, etc. Eventually, plants shed off these parts.

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