Which one of the following types of organisms occupy more than one trophic level in a pond ecosystem.
1. Frog
2. Phytoplankton
3. Fish
4. Zooplankton
Identify the possible link "A" in the following food chain :    
Plant → insect - frog → "A" → Eagle
1. Rabbit
2. WoIf
3. Cobra
4. Parrot
Identify the likely organisms (a), (b), (c) and (d) in the food web shown below:

Options
| (a) | (b) | (c) | (d) | |
| 1. | deer | rabbit | frog | rat | 
| 2. | dog | squirrel | bat | deer | 
| 3. | rat | dog | tortoise | crow | 
| 4. | squirrel | cat | rat | pigeon |