Answer:
In heart valve disease, one or more of the valves in your heart doesn't work properly. Your heart has four valves that keep blood flowing in the correct direction. In some cases, one or more of the valves don't open or close properly. This can cause the blood flow through your heart to your body to be disrupted.
It engages in a reforestation project
Answer: In Stage 4 of the Demographic Transition Model birth rates and death rates are both low, stabilizing total population growth. The decline in both birth and death rates of most Stage 4 countries have been attributed to strong economies, highly educated citizens, ample healthcare systems, the migration of people from rural communities to cities (Bulgaria)
Explanation: i dont know if it's correct to them
These greenhouse gases are trapping the heat inside the atmosphere. When more of these gases are released, it contributes to global warming and the melting of many polar areas that could potentially cause a natural disaster in the future.
Hello!
I will need a image to properly answer this question.
Thanks!~