Explanation

Piaget stated that children in the concrete operational stage (ages 7–11) can think logically about concrete events but struggle with abstract or hypothetical reasoning.

Deductive logic, which involves drawing specific conclusions from general principles, develops later in the formal operational stage.

Explanation

Proper posture, avoiding heavy lifting, and stretching exercises help prevent back pain and injury.

These practices reduce strain on the spine and improve flexibility and strength.

Explanation

Smog is caused by pollutants like sulfur dioxide (SO₂) and nitrogen oxides (NOₓ), which are released from burning fossil fuels (coal, oil, and gas).

These pollutants react with sunlight to form ground-level ozone and particulate matter, leading to smog formation.

Explanation

Joe Biden becomes oldest person ever to be elected as US President in U.S history.

**

According to Article II of the U.S. Constitution, the president must be a natural-born citizen of the United States, be at least 35 years old, and have been a resident of the United States for 14 years.

**

Explanation

Respiration is the process where oxygen is used to break down glucose, releasing energy (ATP) and producing carbon dioxide as a byproduct.

It occurs in the mitochondria.

It is essential for all living organisms.

Explanation

Using the identity:

a³ + b³ = (a + b)³ - 3ab(a + b)

Given:

a + b = 4

ab = 3

Substitute the values:

a³ + b³ = (4)³ - 3(3)(4)

= 64 - 36

= 28

Explanation

The captain is the official leader of the team on the field.

The captain represents the team in discussions with referees and ensures team coordination.

Explanation

A function f: A → B is called onto (surjective) if Range(f) = B, meaning every element in B has at least one preimage in A.

In other words, for every b ∈ B, there exists a ∈ A such that f(a) = b.

Explanation

Usury is a thing or concept — specifically, the practice of charging excessive interest on loans — which makes it a noun.

In the sentence, it functions as the object of the verb “take.”

Explanation

"Uncle" starts with a vowel sound /ʌ/, which is a true vowel sound.

Though "Uniform" and "Usual" start with vowel letters, they begin with a /juː/ sound (a consonant sound).