How are the percentages of deaths in middle-income and high-income countries similar?
a. the largest percentages of deaths come from lung cancer, stroke, and heart disease.
b. the largest percentages of deaths come from hiv/ aids-related illnesses.
c. the largest percentages of deaths result from premature births.
d. the largest percentages of deaths result from tuberculosis, lower respiratory infection, and malaria.

This is all you, but i can give you some topics that you could try. if it rained when you want to do something outdoors, it 'limits' that human activity. maybe you want to do an experiment that goes throughout the whole year and you have to have above freezing the entire year. this 'limits' your activity. i thought of those just off of the top of my head. something that gets to me that might be getting to you is you are thinking too hard about what to do. think simply, and if it is too simple, then bump it up just a little bit.

Sequoia national park  /  inyo national forest, california, u.s. mount whitney is the tallest mountain in california, as well as the highest summit in the contiguous united states and thesierra nevada—with an elevation of 14,505 feet (4,421 m).

The answer is that they depend on rainfall for their crops to grow. hope this .

The answer would be c.