Answer:
ICMP Echo Request
Explanation:
ICMP Echo Request is a form of probe or message sent by a user to a destination system.
Transferring or sharing electrons between atoms forms a covalent bond.<span> Covalent
bonding is when atoms share electrons. It is a chemical bond that involves the
sharing of electron pairs. These pairs are called bonding pairs. Examples of
compounds that has covalent bonds are CO2, organic compounds, lipids and
proteins.</span>
Because of the crystal structure of the ice, ice has lower density than liquid water. So the volume of the ice of same mass is greater than water. When melting, the volume will decrease.
D. Cell membrane: surrounds a cell and allows substances to pass in and out