Vertebrates, and a few invertebrates, have a closed circulatory system. Closed circulatory systems have the blood closed at all times within vessels of different size and wall thickness. In this type of system, blood is pumped by a heart through vessels, and does not normally fill body cavities.
Answer:
Family members may help each other, by giving moral support. And caring for each other in times of need.
Hope that somewhat helps
Explanation:
this is true! someone can have it and not have any presentable symptoms
Answer:
option 3
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Nothing at all! What are you doing step bro?
