The respiratory and circulatory system work together to deliver oxygen to body cells.
The respiratory and circulatory systems work together to deliver oxygen to body cells. The respiratory system is responsible for breathing in oxygen and expelling carbon dioxide, while the circulatory system transports oxygen-rich blood to the cells. Within the circulatory system, the heart pumps oxygenated blood through arteries to the body's tissues, where oxygen is delivered to the cells through capillaries.
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a. scales
c. lipids
b. hair
d. tibia
front has 4 toes and the back has 5 toes
B. Include people who are difficult to contact
C. Ask questions that are too obvious
D. Influence the people in the study
Answer:
D
Explanation: