Which of the following is a division of a stratum and can be made of multiple layers?
a. bed
b. fossil
c. event
d. correlation

Look at the photo of the leaf. which term best describes this leaf?

Study the diagram of a cell. which structure is found only in plant cells and functions in the process of photosynthesis? w x y z

Sarah and john are having a discussion on genetic diversity. sarah believes that it happen over a long period of time. john it happens immediately. who is correct? a. sarah is correct because genetic diversity occurs over a long period of time. b. john is correct because genetic diversity occurs immediately. c. both are correct because genetic variation can occur or long period of time. d. neither are correct because genetic diversity occurs over any period of time