Do u have a picture of the sentences?
The central idea is what the main thing. For this, I think the central idea is simply Cactuses.
I'm not sure what another supporting detail can be, but if there's a back side, or another page about cactuses, I can sure help! But if that's the only side, ask your parents. xD
The rule of thumb is that as soon as an incident occurs, an incident report should be completed. Minor injuries should be reported and taken as equally important as major injuries are. These injuries may get worse and lead to more serious injuries or health issues.
Answer:
Estados Unidos es muy caro y México es más barato.
