Which of the following is not a part of every scientific investigation? Group of answer choices

Collection of relevant empirical evidence

Using models to understand objects and processes better

Use of logical reasoning

Devising hypothesis, making predictions

Agroup of students is studying convection currents. they fill two identical balloons with the same amount of helium. one balloon is placed in a freezer and the other in an area with warm air. after 10 minutes, the balloons are released from a height of 1 meter. which of the following do the students most likely observe? a. the balloons both rise. the cold balloon is larger than the warm balloon. b. the balloons rise at the same rate. both balloons are the same size. c. the warm balloon expands and rises. the cold balloon shrinks and sinks. d. the cold balloon expands and rises. the warm balloon shrinks and sinks.

What overall charge must all compounds have

Type the letter that represents the correct location for each particle type below.