Oxygen, it takes in Carbon Dioxide and releases Oxygen as a waste :)
The correct answer is option C. Endocrine glands secrete hormones into the bloodstream because endocrine glands are ductless and the exocrine glands have ducts so they secrete their hormones into the ducts.
Answer:
Big Joe is the main character or the protagonist
Explanation:
Answer:
because your teacher said it is
