What is the density of the football?
g/cm
calculate the density of the football. use the formula
d= m/v
where d is the density, m is the mass, and v is the
volume. record your calculations in table b of your
student guide

as a general rule, scissors have blades less than 6 in (15 cm) long and usually have handles with finger holes of the same size. shears have blades scissors used to cut hair or fabric must be much sharper

this would be about 43%

the answer you are looking for is d. there are no holes for blood to enter or leave the system. your welcome