What do restriction enzymes do?
A. They cut strands of DNA at specific sites.
B. They separate DNA fragments so they can be seen
C. They make one DNA sample into many copies.
D. They illustrate which chromosomes are present.

Development of new communities in disturbed environments, such as a burned or a clear cut forest, is called

Why is earth's outer core hotter than earth’s oceanic crust? earth’s oceanic crust is denser than earth’s outer core is. earth’s oceanic crust has lava flowing from the mantle. earth’s outer core has a composition of solid iron and nickel. earth’s outer core is deeper within earth than oceanic crust is.

Fill in the blank with the best word to complete the sentence. white blood cells protect against and aid in blood clotting when injuries are sustained.