Answer:
Controlled group does not receive the treatment. It used as a benchmark to measure how different tested subjects affected the result of the experiment.
For example, the famous experiment of whether plants grow faster with music in one room and without music in the other room. The plant in the no music room is the controlled group.
B. Second level consumer because it is not a plant(producer). It is not a decomposed and it is eating the mouse , a first level consumer .
Answer:
Photosynthetic bacteria.
Explanation:
Cyanobacteria also called Photophyta are photosynthetic bacteria even some are nitrogen-fixing bacteria. Cyanobacteria have internal membranes. These are flattened sacs called thylakoids where photosynthesis is performed.
I am afraid there is no specific answer to your question becuase there is not only one fell good chemical, there are 4:
Endorphin, Serotonin, Oxytocin and Dopamine.
Hope it helped,
Happy homework/ study/ exam!
A) is a mussel
b) is a bone
