The first step when doing
an
investigation is the observe a situation. True or false?

True! First step is to make objective observations.

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.

if the thermos has a vacuum innner, then heat through conv currents and conduction are reduced = vacuum flask