2.at which smallest level of organization in an organism can the characteristics of life to be carried out?
a.cell
b.organ
c.organ system
d.tissue

3.which is the correct sequence-from biggest to smallest-of the levels of organization in an organism?
a.cell---->organ----->organ system---->tissue
b.organ---->organ system------>tissue----->cell
c.tissue---->cell---->organ----->organ system
d.organ system----->organ----->tissue----->cell​