Answer:
I believe the answer is #3, chemical bonds.
An ecologist conducts<span> a </span>greenhouse experiment<span> to </span>study<span> the </span>effect<span> of nitrogen </span>concentration<span> on the</span>productivity<span> of </span>sunflower seedlings<span>. What is the </span>independent variable<span> in this </span>experiment<span>? make predictions about how nature works</span>
What are your answer choices?
Answer is thorax...
Hope it helps you...
Asexual reproduction because cells divide through the process of meiosis which sexual reproduction.
