Explanation

Explanation

The graph of x = a is a vertical line.

It is perpendicular to the y-axis, which is vertical.

Explanation

Supplementary angles add up to 180 degrees but aren't necessarily equal.

Supplementary angles can have various measures (e.g., 90° + 90°, 120° + 60°, 150° + 30°), showing they don't have to be equal.

Explanation

"I stayed home." is a simple sentence because:

It has one independent clause (subject: I, verb: stayed).

It expresses a complete thought without extra clauses.

Explanation

The subject of a sentence is the doer of the action.

In this sentence, "teacher" is the one who teaches, so it's the subject.

Subject: The teacher

Verb: teaches

Object/Complement: in the class

Explanation

Stomata are tiny pores (usually on leaves) that allow gas exchange (CO₂ in for photosynthesis, O₂ out).

They also regulate water vapor release (transpiration).

Explanation

A Vernier caliper provides precise linear measurements of small objects.

It can measure internal, external, and depth dimensions with high accuracy (usually up to 0.1 mm or 0.01 cm).

Explanation

The Control Unit (CU) directs the flow of data and instructions within the CPU.

It manages communication between the memory, ALU, and input/output devices.

Explanation

Deserts form mainly due to very low or no rainfall over long periods.

This leads to dry, arid conditions with sparse vegetation.

Explanation

Caves are mainly formed when water erodes soluble rocks like limestone over long periods.

This process is called chemical weathering.

It is leads to underground hollow spaces.