Kết quả phân tích nguyên tố trong phân tử một peptide X như sau: %C = 41,10%; %H = 6,85%; %N = 19,18% (về khối lượng); còn lại là oxygen. Từ phổ khối lượng, xác định được phân tử khối của X bằng 146. Phát biểu nào sau đây là đúng?

 Những người sản xuất, cung cấp hàng hoá, dịch vụ và thị trường, đáp ứng nhu cầu tiêu dùng của xã hội được gọi là gì?

Read the following passage about Asia’s culture and mark the letter A, B, C or D on your answer sheet to indicate the best answer to each of the following questions

[I] Chemicals are present everywhere in our environment, some of which occur naturally, while others are the result of human activities. [II]. They are found in the air, water, and soil, and can have both positive and negative impacts on the ecosystem. Some chemicals, like nutrients, help support life by promoting plant growth [III]. However, others, especially synthetic chemicals such as pesticides, fertilizers, and industrial waste, can be harmful to both the environment and human health. [IV]

The widespread use of pesticides and fertilizers in agriculture has been a major cause of chemical pollution. When these chemicals are used improperly or excessively, they can wash into rivers, lakes, and oceans, leading to water pollution. This runoff can also contribute to the depletion of oxygen in water bodies, a process known as eutrophication. Eutrophication harms aquatic life, disrupting ecosystems and causing the death of fish and other organisms that rely on oxygen.

Toxic chemicals such as heavy metals (e.g., mercury and lead) pose additional threats to the environment and human health. These substances can accumulate in the food chain, starting from plants and animals in contaminated areas and eventually reaching humans. Long-term exposure to these chemicals can lead to serious health issues, including neurological disorders, cancer, and other chronic conditions. Many countries have established regulations to limit the use of harmful chemicals, but enforcement remains a challenge.

Efforts to reduce chemical pollution involve a combination of government regulations, technological innovations, and public awareness. Governments worldwide have introduced stricter rules on the use of hazardous chemicals and encouraged the development of eco-friendly alternatives. These regulations aim to limit the harmful impact of chemicals on the environment, encouraging industries to adopt safer practices. Environmental organizations play a vital role in monitoring chemical pollution, raising awareness, and advocating for cleaner technologies. They work closely with policymakers to ensure effective enforcement of environmental laws. While progress has been made, ongoing efforts are needed to address emerging challenges and ensure a safer and healthier environment for future generations.

The word "depletion" in paragraph II is OPPOSITE in meaning to ____.

Nội dung nào sau đây không phản ánh đúng ý nghĩa quốc tế từ sự ra đời của Liên bang Cộng hoà xã hội chủ nghĩa Xô viết?

Fill in each blank with the correct form of the verb in brackets.

More animals will lose their homes if we _____ (cut) down more forests.

:  Một máy phát sóng vô tuyến AM đẳng hướng trong không gian. Ở khoảng cách \[30{\rm{ }}km\] từ máy phát này, ta nhận được sóng có cường độ bằng 4,42.10^-6 W/m². Công suất của máy phát này là bao nhiêu kW?

Complete each of the following sentences using the cues given. Write full sentence.

(You can change the cues and use other words in addition to the cues to complete the sentences.)

She / participate / judge / famous / TV / programs / such / Vietnam Idol / The Voice of Vietnam / few years / ago.

Có bao nhiêu số tròn chục $x,$ thỏa mãn: $68\lt x~\lt 92$?

Trường hợp nào sau đây không có từ trường?

Cách mạng 4.0 giúp trồng trọt:

Phát biểu nào dưới đây không đúng về ammonia?

Vùng nào dưới đây có diện tích rừng nhỏ nhất nước ta?

Phát biểu nào không đúng với nhân ngoài Trái Đất?