So um can sum one make sure i’m write?
The three main worm phyla are flatworms, roundworms, and segmented worms. Roundworms have a digestive tube that has two openings. Segmented worms have a closed circulatory system in which blood is enclosed in blood vessels. These are important steps in the evolutionary development of animals.
Answer:
i know the answer
Explanation:
negative feedback is bad feedback that the person did not like the subject, posative feedback is when the person likes the subject, hope i helped
I think two are stem cell research and cloning
A simple example is the connection between the circulatory and respiratory systems. As blood circulates through your body, it eventually needs fresh oxygen (O2) from the air. When the blood reaches the lungs, part of the respiratory system, the blood is re-oxygenated.
hope it is write i kind ask my friends
