What was the purpose of the vinegar in the third trail a b c or d​

Which sequence correctly shows the path of carbon dioxide during repiration?

What’s the student’s scientific question

Asquirrel population lives in an area. over many years, a river in that area grows wider and stronger, eventually forming a canyon. the squirrel populations on the two sides of the canyon can no longer mate with each other and ultimately form distinct species. this is an example of