Question

question 1
4 pts
which objects cannot be observed in detail without a microscope? choose more than one answer.

• bacterium
• dinosaur fossil
• red blood cell
• dust particle
• snowflake
• volcanic rock

Explanation:

To determine which objects need a microscope for detailed observation, we analyze each:

• Bacterium: Typically microscopic (size ~1 - 5 μm), requires a microscope.
• Dinosaur fossil: Macroscopic (visible to the naked eye), no microscope needed.
• Red blood cell: Size ~7 - 8 μm, too small for naked - eye detail, needs a microscope.
• Dust particle: Can vary, but many are microscopic (e.g., fine dust), requiring a microscope for detail.
• Snowflake: Can be seen with the naked eye (though a magnifying glass helps, not always a microscope).
• Volcanic rock: Macroscopic, visible without a microscope.

Answer:

A. Bacterium, C. red blood cell, D. dust particle