2. The accompanying graph shows the relationship between mass and volume
for three samples, A, B, and C, of a
given material. What is the density of
this material?
35
30
25
20
8
Mass (o)
B.
15
10
A
5
5
-
0
0
5
LO
1 2 3 4
Volume (cm)
(1) 1.0 g/cm
(2) 5.0 g/cm
(3) 10.0 g/cm
(4) 20.0 g/cm
2

The higher you go up the less oxygen there is 

Neurotransmitters are messengers responsible for communication between neurons. they are released from synaptic vesicles and are received by receptors.  the communication is referred to as neurotransmission. the following statement is true about neurotransmitters: a. they're stored in synaptic vesicles in the axon.

Digestion because it removes waste