Elements Present in Samples Sample Elements 1 Hydrogen, phosphorus, and nitrogen 2 Aluminum, silicon, and copper 3 Calcium, potassium, and nitrogen Iron, oxygen, and magnesium Which sample was most likely DNA? A. Sample 1 B. Sample 2 C. Sample 3 D. Sample 4

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.