After the skin is cut and a capillary wall breaks, what's the first step in working to form a clot? a. thrombin causes sticky fibrin filaments to form the clot. b. the clot seals the area to prevent further blood loss. c. a set of reactions are triggered. d. platelets clump at the site.

Several bird species feed in a certain species of tree. each bird species feeds in a different part of the tree. which statement is true of these bird species? a. they have adapted to different niches due to competition b. they have a carnivorous relationship with the tree species. c. they have adapted to different niches due to predation d. they have a symbiotic relationship with the tree species.