Your spinal cord works like a Telephone wire, sending messages back and forth between your body and your brain.
Bacteria reproduces by cell division rather than meiosis.
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:
I would asy thd answer would be d if its not my bad .
