Just letting you know, I got this answer from the internet.
1) hunter-gathering tribes
2) small towns and nomadic groups
3) city-states and small kingdoms
4) empires
5) nation-states
Coral reef destruction is caused of course by climate change, responsible for our warmer oceans. Corals cannot survive if the water temperature is too high. Higher water temperatures is the main reason behind the death of nearly half of the Great Barrier Reef’s corals.
Urban and industrial waste and oil pollution from shipping are poisoning reefs too – some pollutants, such as sewage and runoff from farming increase the level of nitrogen in seawater, causing an overgrowth of algae, which smothers reefs by cutting off their sunlight.
So A, B and C are the correct answers
True.
For people who use K12, this is the correct answer:))
I had this on my test too, and I scored a 100!
Answer:
the 3rd sentence
Explanation:
because they need to have a good source of water and food.
Encryption is the use of code words or other things such as a different language to transmit data that is able to be understood by only those that use it. An example was during World War II, Americans in the Pacific theater fighting against the Japanese brought Navajo speaking Native Americans to transmit data to other American forces. They did this because the Navajo language was completely unknown to the Japanese and weren't able to decipher the transmissions that they intercept.
