⚠️please help ASAP, this is a one of the last questions for a very important test I’m taking and I would like to make sure my answer is correct In reference to the Phylum
Echinodermata, what is a water
vascular system?
A. a network of water filled canals that help with
locomotion and gas exchange
B. the body plan that allows water to pass through to filter
feed
C. a thick layer on the outside of the organism that
protects it from dehydrating in the salt water

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.

which