Arrange the following living organisms from simplest (least complex) to most complex: Items: a. Amoeba b. Oyster c. Worm d. Cow Choose the correct ascending biological complexity sequence.
-
Aa, c, b, d
-
Ba, b, c, d
-
Cd, c, b, a
-
Dc, b, d, a
-
ENone of these
Answer
Correct Answer: a, c, b, d
Explanation
Introduction / Context:Logical sequencing in biology often asks you to arrange organisms by structural/organizational complexity, typically from unicellular to more complex multicellular animals.
Given Data / Assumptions:
- Amoeba (a): unicellular protozoan.
- Worm (c): simple multicellular invertebrate.
- Oyster (b): mollusk; multicellular with specialized organs.
- Cow (d): vertebrate mammal; highly complex systems.
Concept / Approach:Place unicellular first, then simple multicellular invertebrates, then more specialized invertebrates, and finally vertebrates/mammals.
Step-by-Step Solution:
Start: Amoeba (a) — single-celled, least complex.Next: Worm (c) — multicellular but comparatively simple body plan.Then: Oyster (b) — organ-level systems, more complex than worms.Last: Cow (d) — vertebrate mammal with complex organ systems.Verification / Alternative check:Any reversal placing oyster before worm would ignore relative organ complexity; placing cow earlier contradicts vertebrate advancement.
Why Other Options Are Wrong:
- a,b,c,d: Puts oyster before worm against typical complexity comparisons.
- Other orders reverse or scramble complexity levels.
- None of these: Not applicable because a correct ascending sequence exists.
Common Pitfalls:Confusing ecological sophistication with biological complexity; the question is about structural organization.
Final Answer:a, c, b, d