In which groups animals, closed circulatory system is found? Why blood flows with faster speed and high pressure in these animals?

2

(a)

Sponges are filter feeders.How does it take place?

2

(a)

How will you differentiate between the heart of an amphibian and a reptile?

2

(a)

Justify 'snakes have a strong sense of smell'.

2

(a)

Endoparasites are found inside the host body. Mention the special structures possessed by these to enable them to survive in those conditions.

2

(a)