What are three differences between rna and dna?

Which element is used in photosynthesis found in atmosphere and fixed by bacteria?

What are genotypes? what are phenotypes?

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.