Which structure contains pockets or puckers that are called haustra?

Categorize each term as something that is typical of a scientific theory, a scientific hypothesis, or both. makes predictions

Me with biology endocrine system crossword also image left i need with hw

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