Having more then one independent variable will give unreliable results. Hope this helps
Explanation:
Solar UV radiation. Australia experiences some of the highest levels of UV radiation in the world because we are close to the equator and have many clear, blue-sky days. The Earth's orbit also brings countries in the southern hemisphere (Australia included) closer to the sun in the summertime than countries in the northern hemisphere during summer.
<span>The group includes their common ancestor but also the seeded descendants of that same ancestor.</span>
I think tracheae which is B not sure tho
Answer:
option A
Explanation:
because plants give oxygen
