Phylogenetic trees are often used to track what evolved from what.
You would expect an earthworm to have no exoskeleton because as you see it is very flexible and soft. Organisms with such have body parts that are divided and an earthworm do not have any visible parts on them also having an exoskeleton would not allow an organism to move like an earthworm does.
<em>A. 11.0 L is the researcher's volume measurement to the SL units of liter</em>
<u>Explanation:</u>
Given that a researcher recorded that the chemical reaction has water = 2.90 gallon.
We have to convert the researcher's volume into the SL units of liter.
<em>So, we know that 1 gallon = 3.875 liters</em>.
Then we have to convert 2.90 gallons of water in to liters.
Then , volume in L =
=
= 
<em>Then the required volume in
</em>