Information passes from the axon of one cell to the dendrite of another cell across a tiny gap called a/n
a. receptors
b. neurotransmitters
c. acetylcholine
d. synaptic cleft

D. Synaptic cleft

Explanation:  

The transmission of nerve impulses between two neurons takes place  between the axon of one cell to the dendrite of another cell, and this process is called synapses.  The synaptic structure is formed by the presynaptic membrane, the synaptic cleft and the postsynaptic membrane.

...............................................

I hope this can help. Regards. María

answer: zinc is the substance which has a volume of 1.38 .

density is defined as the mass of an object per unit volume.

it can be calculated by dividing mass of a substance by its volume i.e.

si unit of density is kg per cubic meter and cgs unit of the same is gram per cubic centimeter.

now from the given data volume can be calculated by the formula .

hence, the volume of aluminium will be = which comes out to be 1.703 .

similarly, volume of zinc, chromium, and nickel will be 1.378 , 0.869 , and 0.356 respectively.