Astudent brings a specimen and claims it is a living organism. explain how a microscope could be used to determine if the specimen is a living thing.

When proteins are being produced by a cell, scientist say that the genes are question 2 options: activated turned off replicated deactivated

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

10. in which phase will crossing-over occur? a. mitosis b. metaphase ii c. prophase i d. meiosis ii