You busk when you play music or put on some other kind of performance in a public place, and people give you money.
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.
Scientific name: phylum: mollusca
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.