The ring canal, stone canal, radial canals, and madreporite are all parts of the
system
O a. Nervous
O b. Water Vascular
O c. Circulatory
d. Digestive

if the type of the food available changes, then the frequency of beak types will change, because birds with beaks more suited to the available food will be more successful over time.

i think that you are smart and you should fit for it out

if you add everything up correctly you should get 69 i got this because 50 plus 19 is it