Answer:
b. hormones
Explanation:
"The endocrine system is made up of glands that make hormones. Hormones are the body's chemical messengers. They carry information and instructions from one set of cells to another"
Which of the following statements is true?
B. A habitat represents all the biotic factors in an ecosystem.
Nothing I really don’t think there is an answer to that
Explanation:
I'm gonna guess your heart but I think I might be wrong
Answer:
I believe it must pass through 4 chambers
Explanation: