Select the correct answer.
Kelvin's cow is showing signs of poor health. The cow is staying away from the herd and is 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?
A. muscular system
B. endocrine system
C nervous system
D. circulatory system

The light is great source of energy

Sorry  i don't understand can you rephrase that

Hmm this is a hard heterotroph's can't produce its own food. a human can produce it's own food because people kill animals and eat them like squirrel, deer, oak trees need rain which they don't produce the rain, bee's need flowers and pollen and nectar but they don't produce it either, rabbit's don't produce either, because they either steal carrots from your garden and eat leaves.so, the best answer that i would pick is a. humanshope my answer has you and sorry if it doesn't : ) : (