Read the paragraph below and answer the question that follows.

"The helical gears are similar to spur gears but have angled teeth. This helical tooth arrangement enables smoother and quicker operation compared to spur gears. Helical gears are commonly used in applications where high torque transmission and reduced noise are essential."

Write any two key differences between helical gears and spur gears.

What are temperature sensors?

Write any two differences between an autonomous system and automated system.

Mention any two types of cyber threats.