which statement explains why oxygen molecules easily diffuse across a cell membrane while dna molecules do not?  a. dna molecules contain carbon atoms, while oxygen molecules have only oxygen atoms.  b. dna molecules have phosphate groups that the cell membrane repels.  c. oxygen molecules are very small, while dna molecules are very large.  d. oxygen molecules are more useful to a cell than are dna molecules.

Por qué crees que los huevos con cáscara se llaman amnióticos?

Text version using the diagram above, match the description to the corresponding location in the carbon cycle model. provide the letter only. carbon dioxide is converted to sugar used for food. carbon trapped in fossil fuels is converted to carbon dioxide. organic carbon is converted to fossil fuels. carbon dioxide is converted to carbonates. sugar is broken down and converted to carbon dioxide. location location location location location

Animal cells have which of the following characteristics? select all that apply.