In general, yes, the dorsal blood vessel of a worm be seen from the worm's exterior because a worm's "skin" is very thin. Although of course there are exceptions.
The gradual evolution for the family Equidae (horse family) has been well documented within the fossil record.
Answer:
(Not wanting to spend or use something)
Explanation:
Like someone or something really cheap, not wanting to use something in a way that it is a waste.
A man's car broke down, he didn't want to spend any money repairing it so he did it himself.
Or could just mean being careful with your resources.
I am like 99% sure its organ , try that and see if it works :)
If your hypothesis is supported then good job! you made a good hypothesis. next you should collect your results and put them into a table to share