(a) calculate the number of cells in a hummingbird assuming the mass of an average cell is ten times the mass of a bacterium. (b) making the same assumption, how many cells are there in a human?

Given :

Average mass of the cell = 10 X mass of bacterium.

Number of cell=  (Mass of humming bird)/ (mass of the [email protected])

a) The mass of a hummingbird is  , while the mass of a cell is  . The number of cells in the hummingbird is

                    〖10〗^(-2)/〖10 X 10〗^(-15) = 〖10〗^12  cells

Number of cells in humming bird = 1012 cells

b) The mass of a person is  .

                    (〖10〗^2  kg)/(10 X 〖10〗^(-15) )= 〖10〗^16  cells

Number of cells in human = 1016 cells

answer: land bridge theory. land bridge theory held that shifting portions of dry land explained the finding of identical species on different continents. plate tectonic theory eventually eliminated the land bridge theory.