Explanation

• Water (H₂O) is a polar solvent due to its asymmetrical molecular structure.
• It results in a slightly positive charge on the hydrogen atoms.
• A slightly negative charge on the oxygen atom.

Last verified on 28-10-2026

Explanation

• Observation is the first step in the scientific method, which is used to solve biological problems.
• Scientists make observations about the natural world, notice patterns or phenomena, and ask questions about what they have observed.

The correct order of the scientific method is:

• Observation
• Question
• Hypothesis
• Prediction
• Experimentation
• Data analysis
• Conclusion

Last verified on 28-10-2026

Explanation

• Bronchitis is the inflammation of the bronchial tubes, which carry air to and from the lungs.
• It commonly causes coughing, mucus production, chest discomfort, and sometimes shortness of breath.
• Bronchitis may be acute, often caused by viruses, or chronic, commonly associated with long-term exposure to irritants such as cigarette smoke.

Last verified on 28-10-2026

Explanation

• A pair of unlike parallel forces (forces that act in opposite directions) with different lines of force produce a couple.
• It is also known as a moment or torque.
• This is a rotational force that tends to cause rotation around a pivot point or axis.

Last verified on 26-10-2026

Explanation

• Most skull bones are connected by fixed joints, also called suture joints.
• These are fibrous, immovable joints that hold the skull bones firmly together and protect the brain.
• The lower jaw is an exception because it forms a movable joint with the skull.

Last verified on 23-10-2026