Question

2. These are the chemical substances which are the secretions of ----------
endocrine glands.
3. The first menstrual flow that begins at puberty.---------
4. These glands secrete hormones which maintain the correct salt
balance in the blood.-----------​

Answer 1

Answer:

2. These are the chemical substances which are the secretions of ----------

endocrine glands.

3. The first menstrual flow that begins at puberty.---------

4. These glands secrete hormones which maintain the correct salt

balance in the blood.-----------