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.

Explanation

Abdul Qasim Ali Zahravi, also known as Al-Zahrawi, is considered the father of modern surgery.

He wrote the influential medical encyclopedia Al-Tasrif, which included surgical techniques.

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

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

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

Explanation

The Aedes mosquito, especially Aedes aegypti, is the primary vector of dengue fever.

Anopheles transmits malaria.

Culex transmits other diseases like West Nile virus.

Explanation

Glucose is a small sugar molecule, a simple carbohydrate, not a macromolecule.

Proteins, sucrose (a disaccharide), and fatty acids are larger or complex molecules often considered macromolecules or part of them.

Explanation

A hypothesis is a proposed explanation or possible answer to a scientific problem.

Data are facts collected.

Conclusion is the final decision after analysis.

Explanation

Singer and Nicolson proposed the Fluid Mosaic Model in 1972 to describe the flexible, dynamic structure of the cell membrane.

It shows proteins floating in a fluid layer of phospholipids, like a "mosaic."

Explanation

New cells arise from pre-existing cells through cell division (mitosis or meiosis), as stated in the cell theory.

Old cells do not form from division; they are the parent cells that divide.