19) Larry, Darryl and Jenny are using a gas chromatograph to determine the identify of a chemical sample. They
inject the sample into the machine and then wait to see how long it takes the chemicals in their sample to move
from one end of a tube in the machine to the other end. They use this time to help them determine the identity
of the chemical in the sample,
Which is an unavoidable error in this experiment?

after receiving a stimus, the sensory receptors send(s) signals to the appropriate area of the body.  

the must be sensory neurons.  

hope its .

the rocks are classified by the geological process they are formed by. the three main groups of rocks are igneous, metamorphic, and sedimentary. minerals are not they are classified under the chemical classes they are in. these groups include silicates, sulfates and carbonates.

well first you need the sample of the temperature and gas level. i couldnt write a hypothesis unless i had some data. i think temperature changes will effect volumes of gas because gas changed into a solid or liquid at specific temperatures.

a bird that nests only in a particular tree species.