Question

I. Fill in the Blanks:

1. Friction is caused by___________.

2. Copper is more ___________ reactive than iron.

3. The gas usually filled in the electric bulb is_________________.

4. ______________ gland is called the master gland

5. The structure formed by the fusion of a male gamete with a female gamete

is called ______________.​

Answer 1

1) the interlocking of irregularities in the surface of two objects

2) Iron displaces copper from its solution

3)nitrogen, argon, or krypton

4)pituitary gland

5)zygote

hope it helps