Ajellyfish is a type of cnidarian, a squid is a type of mollusk and a dolphin is a type of vertebrate which two characteristics are present in both a squared and a dolphin but not present in a jellyfish

Ans.  

Jellyfishes are multicellular, marine organisms that belong to phylum Cnidaria. Squids are a type of mollusks, having eight arms and tentacles. Dolphin is a vertebrate that belongs to class mammalia. They produce young, have fur or hairs on the body and complex organ system.

Both squid and dolphin have complex organ systems, nervous system, while complex organ systems are absent in jellyfish.

Both squid and dolphin are triploblastic (having three tissue layers), while jellyfish is diploblastic (having two tissue layers).

the two answers are a, the population of birds with large beaks will increase on the island, and c, the trait for large beaks will be passed on to future generations through natural selection. the reason for that is because if the birds that have beaks developed for eating small seeds lose all of their food, they will go hungry and eventually starve because they physically cannot eat the large seeds, therefore making the population of large beaked birds higher. also, if the trait of large beaks are dominant on the island over small beaks, then over time the large beaked birds will reproduce more and more, while the smaller beaked birds will reproduce less and less because they can't survive with the food provided. that leads to the trait of small beaks disappearing and the trait of large beaks taking over the island.