Oxygen is not involved in any of the reactions of the Krebs cycle. Nevertheless, the Krebs cycle is considered a part of aerobic metabolism. Explain why this is not a contradiction.

Which of these best describes wde by replicating the chromosomes c) the cytoplasm is divided between the two new daughter cells d) the nucleus opens to allow the chromosomes to enter the cytoplasm

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.

Is there any species that went extinct in recent years due to natural causes (not caused by human interaction). if so, what caused it?