Scientists ask __________ about the natural world and conduct __________ to answer their questions.

(a)  

During free exploration, scientists __________.

When making systematic observations, scientists follow (a)   .

All types of scientific investigations include making __________ and collecting __________.

(a)  

Scientists __________ the world around them by using their five senses. An observation is something you __________, __________, __________, __________, or __________.

(a)  

Scientists compare the observations made by different groups using the same tools. When scientists follow the same steps and use the same tools, what they (a)   should be similar. If the observations are different, then the scientists should try to find reasons for the differences.

Scientists ask each other, (a)   .

To answer the question "How do you know?" scientists should provide (a)   to support their thinking.

Scientists are always investigating new ways to solve (a)   .

Make an observation and an inference about what you see in the photo.