Question

insecta 1,000,000

fish 31,200
crustaceans 47,000
mollusks 85,000
fungi 99,000
arachnida 102,200
plants 310,100

mammals 5,500
amphibians 6,000
reptiles 8,700
jellyfish and polyps 9,800
birds 10,000
millipedes and centipedes 16,100
segmented worms 16,800
flatworms 20,000
roundworms 25,000

options:
all organisms in each group are prokaryotes.
all organisms in each group are eukaryotes.
all organisms in each group live in marine environments.
all organisms in each group have four limbs.

Explanation:

1. Analyze Option 1: Prokaryotes lack a nucleus. Groups like Insecta (insects), Plants, Fungi, etc., have eukaryotic cells (with a nucleus), so this is incorrect.
2. Analyze Option 2: Eukaryotes have a nucleus. All the groups shown (Insecta, Plants, Fungi, Arachnida, etc.) consist of organisms with eukaryotic cells. This is correct.
3. Analyze Option 3: Many organisms here (e.g., insects, plants, fungi) live in non - marine environments (like terrestrial), so this is incorrect.
4. Analyze Option 4: Organisms like insects (6 legs), worms (no legs), fish (no legs) don't all have four limbs, so this is incorrect.

Answer:

B. All organisms in each group are eukaryotes.