How many chambers are present in the heart of fishes and frogs?

Write true or false for the following statement:
The animals belonging to phylum $Mollusca$ have a peculiar water-driven tube system that they use for moving around.

Find out the false statement.

State reasons for the following:
$(a)$ Bryophytes are called amphibians of the plant kingdom.
$(b)$ Gymnosperms are called so (naked-seeded plants).
$(c)$ Birds have wings and feathers.

Which among the following have an open circulatory system?
$(i)$ Arthropoda
$(ii)$ Mollusca
$(iii)$ Annelida
$(iv)$ Coelenterata

$A$ student enters the museum and observes the animal specimens. He looks at the one marked 'whale' and calls it a type of fish. How will you explain to him that whales and fishes belong to two different classes? List any three distinguishing features to justify your statement.