Compared to the brains of healthy young animals, the brains of healthy older animals exhibit and , especially when individuals from both groups have been maintained in enriched environments with adequate sensory stimulation, leading to additional changes in neuronal structure, including :

Molecular models of two different substances are shown below. in the molecule on the left, the oxygen atom pulls on electrons more strongly than the hydrogen atoms. in the molecule on the right, the two oxygen atoms pull on the shared electrons with the same strength. water molecule, h,o oxygen molecule, oz when the two substances are put in the same container, they do not attract each other. why does this happen? a. they both contain oxygen. b. one is polar and one is nonpolar. c . they are both polar. d. they contain different elements.

For this question look at the hydropic diagram water that is heated by the sun evaporates. select the number that represents it.

Where can dna be found in a prokaryotic cell