Please help
I need help on the first one
Poor air and water quality, insufficient water availability, waste-disposal problems, and high energy consumption are exacerbated by the increasing population density and demands of urban environments. Strong city planning will be essential in managing these and other difficulties as the world's urban areas swell.
At this point, i think you can allow the line to miss a plot a little bit when passes between circles
pretty much it would look like this ,
just crosscheck it with the data if you're not sure
Hope this helps
Answer:
Protostars are difficult to observe because they are surrounded by cocoons of gas and dust.