Answer:
option 1 and 4
Explanation:
It flows from high pressure to low pressure as air is made up of gases and gases move according to the process of diffusion.
It moves from lower density to higher density as pressure is inverse to density. As density is not what makes the air move it is pressure.
Answer:
In order for something to be classified as living, it must grow and develop, use energy, reproduce, be made of cells, respond to its environment, and adapt. While many things meet one or more of these criteria, a living thing must meet all of the criteria.
Neurotransmitters are released into the synaptic cleft, the gap between synaptic terminals and adjacent neurons, and then bind to special neurotransmitter receptors, molecules on the membrane of adjacent neurons.
Neurotransmitters are body’s chemical messengers produced by the nerve cells. Neurotransmitters are used by the nervous system to send messages to other cells, including other nerve cells and muscle cells. Neurotransmitters are classified according to their functions as; excitatory neurotransmitters, inhibitory neurotransmitters, and modulatory neurotransmitters. The major types of neurotransmitters include; trace amines such as N-methylphenethylamine, amino acids such as D-serine, and gasotransmitters such as carbon monoxide (CO).
An _observation_ is taken using the senses
