How does meiosis maintain the continuation of a species

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.

What organ is the first to receive nutrients that have been absorbed from the digestive tract?

What are antigens and antibodies? how are they involved in the body’s response to incompatible blood?