Explanation:
To answer this question, we need to understand which animals lay eggs.
Animals that lay eggs:
- Birds: Chickens (hens) and ducks are examples of birds that lay eggs.
- Reptiles: Frogs are amphibians that lay eggs.
Options:
- Option A: Hen and frog
- Option B: Hen and duck
- Option C: Hen and crow
- Option D: Duck and frog
Analysis of options:
- Option A: Hen and frog
- Hens are birds and lay eggs, which is correct.
- Frogs are amphibians and also lay eggs, which is correct.
- Therefore, this option is partially correct.
- Option B: Hen and duck
- Hens are birds and lay eggs, which is correct.
- Ducks are birds and also lay eggs, which is correct.
- Therefore, this option is fully correct.
- Option C: Hen and crow
- Hens are birds and lay eggs, which is correct.
- Crows are birds but do not lay eggs. They build nests and lay their eggs in them. Therefore, this option is incorrect.
- Option D: Duck and frog
- Ducks are birds and lay eggs, which is correct.
- Frogs are amphibians and also lay eggs, which is correct.
- Therefore, this option is partially correct.
Conclusion:
After analyzing all the options, we can conclude that the main source of eggs is a combination of hens and ducks, as both of these birds lay eggs. Therefore, the correct answer is option B: Hen and duck.