None because they are children play toys not scientific tools!
<span />
The answers is all of the above
Answer:
research question: how do different humidity levels affect the heights of different types of trees
independent variable: humidity level
dependent variable: tree height
constants: temperature, light, duration of time
control group: tree left outside in normal conditions
Explanation:
Glacier because ice sheet and stuff and science ill explain more in the comments
Answer:
organism,species,community
<em>hop</em><em>e</em><em> this</em><em> answer</em><em> </em><em>correct</em><em> </em><em>(</em><em>^</em><em>^</em><em>)</em>
