<span>The challenge of reproducing is one of important manners which distinguishes migratory birds from another birds. The question is that which examples descrbe such manners, and for that, we can choose A, C and D</span>
<span>The mirror is used to focus light through the opening in the in the stage of the microscope.</span>
They both need nutrients to carry out life functions
Cell membrane, Organells, flagella
