Answer:
An open system is defined as a “system in exchange of matter with its environment, presenting import and export, building-up and breaking-down of its material components.” Closed systems, on the other hand, are held to be isolated from their environment.
Explanation:
There are no options to choose from.
It can tell us about the past events, and the people lives at those times.
Answer:
There are many interesting jobs that surprisingly exist. Brain surgery is one of them. I think that people who do brain surgeries are psychopaths because I can't imagine opening a brain myself. This job is both interesting and dangerous because if the doctor touches the wrong part of the brain, the patient will intinctly die. The human brain looks like your intestines, a pinkish jelly-like substance it's VERY sensitive. I wonder how did scientists discovered how the human brain works. How could a insignificant creature learn all by itself how it's brain works? If we could learn about our brain, then why do other animals can't? How did we discover cells? How did we create technology? This is when I start thinking, Do aliens exist? I have done unstoppable research about how did humans discovered or created technology. I have found absolutely nothing that says about that. But I do now know, that the Egyptians had drawings of aliens in their pyramids. So I now think, Did aliens gave us technology?
I think its either correcting mistakes in capitalization and spelling or deleting paragraphs that do not match the topic
