The answer would be B. Cats.
Cats are the most advanced organisms between the options thus have the greatest amount of cell specialization.
The chemicals, neurotransmitters are released to carry a nerve impulse which is an electric signal transmitted by the nervous system. This impulse transmitted from one neuron to another. Examples of neurotransmitters are serotonin in which scientists thinks that a low level of this is one of the causes of depression.
If the temp.rises then it will lead to excessive evaporation in hydrosphere, on lithosphere it willl cause extreme hot conditions and with the scarcity of water the animals, birds will die and also plants will be affected.Hydrosphere and lithosphere are included in biosphere so it willl altogether effect biosphere...
Look up the symbol that it is pointing to and the name should pop up
C. If your hypothesis is proven then it eventually becomes true. The exact definition for scientific theory is an explanation that can be proved with repeated explanation.
