Which populations are most at risk for developing hiv? (select all that apply.) a. those who are sexually active b. those who are cognitively impaired c. those older than the age of 50 years d. women?

Give three examples of plant activities that are affected by circadian rhythms and natural fluctuations in the length of daylight?

What's the waste product of electrons and pyruvate combining in fermentation?  

The table presents the average day and night temperatures in five cities. it also reveals whether a city receives substantial rainfall (wet climate) or little rainfall (dry climate). which city’s rocks are likeliest to experience frost wedging, and why? a) city a because the consistently subzero temperature would prevent water from melting b) city b because it is a wet region and the temperature fluctuates around the freezing point c) city c because it receives plenty of rain fall and the weather is moderately cool d) city d because the hot and dry weather would cause rocks to absorb water