A decrease or increase of a certain population can affect the food chain of an ecosystem
Lets say bugs start dying at a rapid rate in an swamp ecosystem
The frog population would then decrease because they have no bugs to eat
The frog’s predators would then decrease because of the number of frogs to eat are decreasing.
So on and so forth.
Hope this helps!
I recommend google it's very cool thing called a search engine.
I'd say that the answer is observational study because they're just analyzing the data and if it were an experiment they'd be taking data and comparing it.
Printing Press, but in the 15th century it mostly was used as "woodcut" but its the same thing. Hope this helps!
The Indus people initially known as the Indus River Valley Civilization which covers parts of modern day Afghanistan, Pakistan and India, were high thinkers who had a well organized civilization, made use of standardized weights and measures, seal carving, and were very good developers in the area of metallurgy with materials such as; copper, bronze, lead, and tin.
Today people that occupy these regions are making good innovations in the area of Technology, medicine and treatment and economics.
