Which sphere is not a part of the cycling of oxygen through earths systems

Differences between compact bone and cartilage

According to the cell theory, which describes cells? a. all organisms are composed of multiple cells. b. all cells have the same structure and function. c. cells are found in everything on earth. d. living organisms are not created spontaneously

Which best describes a gene? a. a sister chromatid b. a chromosome c. a tetrad d. a piece of a chromosome