The number of waves passing the observer per second is: - the wavelength
- the amplitude
-the frequency
- the period

i think the answer would d

a scenario where a cell may be needed to perform a form of endocytosis is when transporting large molecules. a scenario where a cell may be needed to perform a form of exocytosis is when releasing the large molecule from the cell.

if you add everything up correctly you should get 69 i got this because 50 plus 19 is it

synapse nervous system