Explanation

Micro molecules (or small molecules) have low molecular weight, like glucose or amino acids.

Macromolecules are large molecules like proteins, carbohydrates, and nucleic acids.

Explanation

This is a well-known proverb: "A rolling stone gathers no moss."

It means a person who keeps moving or changing jobs doesn't gain responsibilities or stability.

Explanation

"Who" is used as a relative pronoun for people in subject position.

Correct sentence: "I have met most of the people who are eager to take part in the competition."

Explanation

"Where" is used to refer to places in relative clauses.

Correct sentence: "Do you remember the town where you were born?"

Explanation

After "the reason," the correct relative word is "why" when explaining a cause.

Correct sentence: "Do you know the reason why our offer was rejected?"

Explanation

The era from 600 A.D to 1600 A.D is known as the period of Alchemists in Muslim history, especially in the Islamic Golden Age.

During this time, Muslim scholars like Jabir bin Hayyan advanced early chemical and alchemical knowledge.

Explanation

"Which" is used for things (like "shop") in relative clauses.

The correct sentence is: "The shop which I go to is closed."

Explanation

Pheretima posthuma is the common species of earthworm found in South Asia.

It belongs to the phylum Annelida.

It is important for soil fertility.

Explanation

Observation is the second step where scientists collect facts using senses or tools.

It leads to forming a hypothesis, a possible explanation to be tested.

The Steps of the Biological Method:

1. Recognition of a problem
2. Observation
3. Hypothesis formation
4. Deduction
5. Experimentation
6. Data collection and analysis
7. Conclusion
8. Theory/law formation (if repeatedly confirmed)

Explanation

Euglena is a unicellular organism, a key characteristic of many Protista.

Although it is eukaryotic and lives in water, being unicellular is the main reason it’s classified under Protista.