Explanation

Light signals, such as semaphore flags or lantern flashes, were commonly used by sailors to communicate over distances.

These signals conveyed messages visually before the invention of modern communication tools.

Explanation

A transitive verb needs a direct object to complete its meaning.

In this sentence, "brought" is the transitive verb and "a gift" is its direct object.

Explanation

"Book" has a short vowel sound /ʊ/ as in "good" or "foot."

"Ball" has a long /ɔː/ sound and "Read" (present tense) has a long /iː/ sound.

Explanation

Alliteration is the repetition of the same starting consonant sound in closely connected words.

In this phrase, the "s" sound repeats in "Silly," "snakes," "slither," and "slowly."

Explanation

Robert Glaser developed the Basic Teaching Model, focusing on clear instructional goals and assessment.

It emphasizes feedback and mastery learning to improve student performance.

Explanation

Most low Earth orbit space stations, like the ISS, complete one full orbit in about 90 minutes.

This allows them to circle the Earth roughly 16 times per day.

Explanation

Helium (He) is a noble gas.

Its atoms do not naturally bond with each other under standard conditions.

It exists as monoatomic (single-atom) molecules.

Nitrogen (N₂), Oxygen (O₂), and Hydrogen (H₂) are diatomic molecules.

It means they naturally form bonds between two atoms of the same element.

Explanation

"Heirs" refers to people who legally receive property after someone's death, which makes it a noun.

It functions as the subject of the sentence, identifying who performed the action (dispatched).

Explanation

In the crouch start (used in sprinting), one knee rests on the ground behind the starting line.

The other leg is bent forward, ready to push off at the start signal.

Explanation

Field events in athletics include jumping (like long jump, high jump) and throwing (like javelin, shot put).

They are distinct from track events, which involve running races.