Use the drop-down menus to complete the statements.
investigations allow for the control of variables and can be repeated.
investigations are usually less time-consuming and less expensive.
investigations make it possible to study a wide range of variables

answer; /// i believe the correct answer is (thrombocytopenia); (a)

the fossil record provides evidence of a common ancestor to many species.

the answer is c.mitochondria. glad to .

i got you i did it ya know what it is just needing to fill this in for a quick task!