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:
What ecosystem are you talking about ?
I would say D...just because of the greenhouse effect
Answer:
D
Explanation:
Its d I think tell me if it's wrong If it is I'm sorry
Answer:
a b e
Explanation:
these are all pros of living in groups