How does the relationship between siblings typically change from adolescence to adulthood? the siblings tend to become closer?

During the adolescent stages in life, things seem so much bigger than they are. You can view that in the positive light or the negative to be honest. As a child, you see your siblings as another human who lives in your home with you, eats the same food, breathes the same air, loves the same parents as you. You fight over the remote control and wrestle with one another over a small toy you both insisted on needing at the same time. Within the next breath, you sit next to them and talk about your day, ask them to defend you from a so called friend who uses your kindness for weakness as your sibling reminds you of why you are so imortant in this life and deserve to be noticed for that... Swingsets, bike rides to the store, a companion who is always there to listen about how mom and dad "just aren't fair!" Fast forward to 30 years old. Life interferes with the time spent together, the playtime becomes few and far between and the bike rides are a distant memory. The things that stay though...those are very similar to my first statements on childhood with them. The love, support and time spent doesn't need to disapear. It turns into a mature type of love. You call one another every few days to check in. Make a coffee date to catch up on her latest life experience and remind them that you are always here. Those bike rides though? Now you can take them together with your own children.

Dcalifornia they have the most people with 200+ people per square mile

Yes you are cute answer theories to explain the colonization of the new world the last great habitable landmass to be occupied by humans focus on the bering land bridge, or beringia, which emerge by siberia and alaska the last ice age.