Explanation

"Noticed" is the 3rd form (past participle) of the verb "notice."

It is used here with "had" to form the past perfect tense — "had noticed."

Explanation

"Sang" is the past tense of the verb "sing" and shows the action performed.

A verb expresses an action, event, or state of being in a sentence.

Explanation

"Heroes" is the correct plural form of "hero."

"Heros" is incorrect in standard English.

Explanation

Business refers to organizational/commercial activities, not a programming structure.

Common Programming Concepts:

Condition: Used for decision-making (e.g., if-else statements).

Sequence: The order in which instructions are executed.

Loop: Repeats a block of code (e.g., for, while loops).

Explanation

A covalent bond is formed when two atoms share electrons to achieve stability.

It commonly occurs between non-metal atoms, like in H₂O or CO₂.

Explanation

Explanation

"A egg" is incorrect because "egg" begins with a vowel sound, so it should be "an egg".

Use "an" before words that start with a vowel sound (a, e, i, o, u).

Explanation

As we move down the alkali metal group, atomic size increases, making the outer electron easier to lose.

This leads to greater reactivity, especially for metals like potassium and cesium.

Explanation

The ozone layer absorbs and blocks the majority of the Sun’s harmful ultraviolet (UV) radiation.

This protection helps prevent skin cancer, cataracts, and damage to ecosystems.

Explanation

The transfer of data from one place to another is called data communication.

It involves sending data through a communication medium like cables or wireless signals.