Giraffe ancestor with slightly longer necks were able to reach taller food sources; these organisms survived longer and produced more offspring with the favorable variation. A. artificial selection
B. Natural Selection
C. both

Check all that apply diatoms are marine algae that have a shell made of silica, what are some of the uses of the silica shell after the diatoms die? 1.the shells make up the diatomaceous earth used in filters 2.it can be used as an ingredient in abrasives 3.they are used in food products 4.the shells can be used in some insulating materials

Stephen is a student who wants to test his knowledge of medical terminology. which option could he use?

What is the most abundant vertebrate on earth?