Which of the following statements is true of the relationship between population growth and public health? a. public health improvements have contributed to world population growth. b. nations with good public health tend to have higher birth rates. c. in third world countries, migration to cities contributes to better public health. d. public health in the united states is not affected by population growth in third world countries.

The correct answer is A. Public health improvements have contributed to world population growth.

Explanation

Public health is a discipline that is responsible for studying issues related to health improvement, disease control, and elimination. For this reason, it has been a determining factor for population growth in the last decades this can be explained as in previous centuries health services and disease control conditions were more limited due to the lack of study in these fields but today, there are instruments such as microscopes, tests, exams, among others to control and eliminate diseases. Also, the health conditions are more rigorous which reduces death rate and support population growth. So, the correct answer is A. Public health improvements have contributed to world population growth.

answer:

i don't believe the ocean is purple, but it might once have been:

as for the sky, according to nasa:

"sunlight reaches earth's atmosphere and is scattered in all directions by all the gases and particles in the air. blue light is scattered more than the other colors because it travels as shorter, smaller waves. this is why we see a blue sky most of the time."