C. Organ System
Like said in the definition above, an organ system is a group of organs working together to perform a specific function for the organism.
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The new species come from old ancestors of the animals that were there, over time they slowly evolved, and they adapted to that new environment.
Xx is the answer tell me if I'm wrong.
A chromosome is a DNA (deoxyribonucleic acid) molecule with part or all of the genetic material (genome) of an organism. Essentially, chromosomes are the basic building block of who we, as humans, are. They make up or DNA structure and are responsible for if we have blue eyes or black hair, without chromosomes, us as humans wouldn't exist. We, as humans, are the organisms that chromosomes make.
You didn't really provide any possible answers here. However, it's very easy to say that the responsible actors for impulse transmission across the synapses from one nervous cell to another nervous cell is what we call neurotransmitters. These are special molecules that can have different effects when binding onto the required receptor sites.
