Which of the following has nephridia for excretion?

1. spider
2. tapeworm
3. earthworm
4. shrimp

Which of the following has an exoskeleton?

1. octopus
2. snail
3. leech
4. beetle

The body temperature of warm-blooded animals

1. keeps fluctuating
2. changes according to the temperature of the environment.
3. does not change with the change in the temperature of the environment
4. decreases when the temperature of the environment increases.

Which of the following is an amphibian?

1. turtle
2. salamander
3. alligator
4. crocodile