Kelvin's cow is showing signs of poor health. The cow is staying away from the herd and not alert in its environment. The veterinarian believes that the cow is affected by some type of infection. He also states that the lack of white blood cells in the cow is making it less resistant to the
infection. Which system of Kelvin's cow is not functioning properly?
ОА
muscular system
OB
endocrine system
Ос.
nervous system
OD
circulatory system