Annelids have a

1. soft, unsegmented, bilaterally, symmetrical body
2. soft, cylindrical, segmented, bilaterally symmetrical body
3. soft, segmented, bilaterally symmetrical body
4. soft, segmented, laterally symmetrical body

Which of the following has nephridia for excretion?

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

Scorpions and spiders are

1. crustaceans
2. arachnids
3. myriapods
4. insects

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.