What are some of the challenges faced by nations today, and how do they combat these challenges?

 Things like co-vid-19 are challenges faced, and vaccines are what they use to get rid of it, pollution is another issue, solar energy is a combat for the issue, littering is another issue, and cleaning up is the way to solve it, running out of resources; Recycling to reuse the items.

Explanation:

the percentage of students at the school need special diets is

c) 10 percent