If you use more than one independent variable at a time, and will observe a change, you will not know which variable contributed to a changed result.
Answer:
B
Explanation:
Light shows duality i.e it shows properties of both particle as well as wave.
Any substance that triggers an immune response is an antigen(s).
I believe the answer your looking for is they hang upside down all the time this is one of their survival skills! Hope this helps!
