Explanation

Enterobius vermicularis is the scientific name for the threadworm.

It commonly causing pinworm infections in humans.

It is a type of nematode (roundworm) that primarily affects the intestines.

Explanation

Course evaluation refers to the process of collecting student or participant feedback to assess teaching effectiveness and content delivery.

It helps in improving future instruction and identifying strengths and areas for development in a course.

Explanation

Some algae and photosynthetic bacteria can produce hydrogen using sunlight through biophotolysis.

They use enzymes like hydrogenase to convert water into hydrogen gas during photosynthesis.

Explanation

To find the common factors, let's list the factors of each number:

Factors of 30: 1, 2, 3, 5, 6, 10, 15, 30

Factors of 45: 1, 3, 5, 9, 15, 45

Factors of 54: 1, 2, 3, 6, 9, 18, 27, 54

The common factors are 1 and 3.

Explanation

"Theirs" shows ownership of the garden, making it a possessive pronoun.

It replaces a noun and indicates something belongs to "them."

Explanation

"To catch the bus" starts with "to" + verb, which is an infinitive form.

It functions as a phrase explaining the purpose or reason related to "time."

Explanation

Copper has higher conductivity, strength, and corrosion resistance, leading to fewer failures and repairs.

Its durability and long lifespan reduce replacement and maintenance costs over time.

Explanation

In this sentence, "He's" is a contraction of "He has", showing present perfect tense.

"He has written a letter" is the full form.

Explanation

Given a + b + c = 9 and ab + bc + ca = 20

We know that (a + b + c)² = a² + b² + c² + 2(ab + bc + ca)

Substituting the given values:

(9)² = a² + b² + c² + 2(20)

81 = a² + b² + c² + 40

Now, find a² + b² + c²:

a² + b² + c² = 81 - 40

= 41

Explanation

Work done is constant.

If 6 workers take 5 hours, total work = 6 × 5 = 30 worker-hours.

For 3 workers, time = 30 ÷ 3 = 10 hours.