Biological diversity, food production, average global surface temperature and carbon dioxide concentrations in the atmosphere
Answer:
B
Explanation:
because that's what i would choose :)
The nervous system is referred to as a communication system because it carries messages to and from all parts of the body.
The correct answer is: A) GABA
GABA or γ-aminobutyric acid is a type of amino acid that's found in proteins. It is the main inhibitory neurotransmitter in the brain which means that GABA reduces neuronal excitability throughout the nervous system. GABA binds to its receptors that are located on the neuron’s plasma membrane. This binding causes the opening of ion channels that transport chloride ions into the cell or potassium ions out of the cell.
D
because it reflects the same shape of the figure on the top half
