So we have two limestone beds, one of 550 million years old (well, the fossils are, but it suggests that the rock was created around the same area) and another that is 400 million years old. The first one is then older than the second - the correct answer is c!
The answers are:
- Building smaller houses and focus on vertical building; building small and practical houses and focusing on vertical building are essential because on a smaller space there can be accomodated much more people.
- Building homes on abandoned unclaimed land; there's lots of acres of land that is just left to be even though it is not owned by anyone, so using this land for making houses and flats is of great importance for rational and practical usage of the land for accommodation of large number of people.
- Increase the GMO's so that there's bigger food production for smaller price; GMO's are known to give much more than the natural plants and they are also much less demanding in conditions for production and expenditure, so they can solve a big portion of the food scarcity problem.
The answer is Venus. That's the hottest planet.
It can be both
by improving transportation routes to Mecca
and
by improving sanitation and medical facilities
