Bob has an unknown liquid and must determine what it is. he decides to systematically use a number of tests to determine the correct answer. according to piaget, bob has most likely reached the stage of cognitive development.

The Formal Stage

Explanation:

The Stages of cognitive development are as follows:

The Sensorimotor Stage, which is what babies go through, and consists of touchy-feely actions. The name comes from "Sensor" (feelings, nerves) and "Motor" or actions and movements.

The Preoperational Stage is when younger children begin to develop reading and writing skills, along with speech and recognization skills.

The Concrete Operational Stage is where kids start thinking more logically, instead of pretend situations. For example, a boy might understand a dog will play with him if he is calm and collected, instead of when he is rough and loud, thus scaring the dog away.

The Formal Operational Stage is when older kids start to make more logical conclusions through running tests and collecting data in a organbized way. This is when the child begins thinking like an adult.

Based on the information given, Bob best fits the 4th stage, Formal, because he chooses to do systematic tests to find what the liquid is.

abolish

do away with

unanimous

in complete agreement

secede

separate; break free

inauguration

starting a new position with a formal ceremony.

cooperationist

people who wanted the north to cooperate with the south

surrender

to give up

volunteer

perform a service for free

draft

involuntary service in military

retreat

withdraw; move away from enemy

advisor

expert who gives advice

explanation:

all cities have a governor

all cities are in states or provnies then country

all cities have people

difference

some are rich

some are poor

some are average