What does an h-r diagram relate a star's temperature to?

What is the next step in muscle contraction after the actin changes shape? (apex)

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.

Which organelle plays a role in intracellular digestion?