Rèn luyện thể dục , thể thao đúng cách từ tuổi trẻ có tác dụng là : 1. làm tổng dung tích của phổi đạt tối đa, khí cặn là tối thiểu
2. tạo nên nhịp thở sâu , giảm được nhịp thở , tăng hiệu quả hô hấp
3.tác động đến tuần hoàn hoạt động mạnh , tăng cường vận chuyển khí , tránh được tình trạng thiếu oxivà ứ đọng khí cacbonic
4. tăng cường thể lực
A. 1,2,3 B. 1,2,4 C. 1,3,4 D. 2,3 ,4

answer is a

explanation:

cardiovascular system

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the correct answer is - d. china has a large and growing population.

the fact that china has a large (the biggest) population, and it is still growing, doesn't hinder the agriculture production in the country. in fact, it can for increased production in the agriculture, since there's more labor force, as well the sheer mass of people produces lots of scientists that come up with new inventions as to how to improve this sector. nice example is the inner mongolia region in china, in general dominated by the gobi desert, but few scientist came up with a nice idea as to how to make the region productive by using plants that are very resistant to droughts, so lots of people have been employed, and the region is becoming greener and greener each year, and the production of food in this region is also increasing.

i believe the answer is snake.