Scientists use many different methods of investigation. When possible, scientists want to actually experiment or observe an event. Which method is useful when
developing a scientific reasoning for an event that cannot be studied directly?

Conduct a field survey of bird populations in an area
Observe the effect of various fertilizers on com crop yields
Use a computer model to study how the ocean liner Titanic sank
Use a wind tunnel to measure air drag on various types or automobiles
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Describe how a student should adjust the microscope to see the cells on a slide more clearly?

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? question 8 options: the cold balloon expands and rises. the warm balloon shrinks and sinks. the balloons rise at the same rate. both balloons are the same size. the ballons both rise. the cold ballon is larger than the warm balloon. the warm balloon expands and rises. the cold balloon shrinks and sinks.

Which structure in the cardiovascular system connect arteries to veins?