Answer:
1. D
2. A
3. Not sure, don't know what the images are.
4. Same as 3.
Answer:The first cities were created on the coasts of East Africa.
Explanation:
It depends on what you're asking. If angle a and b are both on a straight line, b would equal 169 degrees because the total has to add up to 180 degrees, but if they are on a right angle, b would equal 79 because it has to add up to 90 degrees.
Answer:
they produce little waste
