​ Why do all cells in the body need oxygen?​​

Athermometer is placed in water in order to measure the water’s temperature. what would cause the liquid in the thermometer to rise?

As a small change in a person's dna can cause a genetic disorder

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.