A husk is the outer layer of a seed, or the covering on a cob of corn or maize.
A husk is also used to describe the outer shell that an insect loses when it moults.
The husks in the photo are coconut husks.
Molluscs are an extremely diverse group of creatures that includes the octopus, squid, snails and clams. Molluscs don't have skeletons. Only some molluscs have shells.
A tusk is a large tooth that sticks out of the mouth of some animals. Elephants, walruses and warthogs have tusks. Elephant tusks are used to make ivory.
