Since each myofibril is attached at either end of the muscle fiber, when sarcomeres shorten, the muscle fiber.

this age may represent the age of the earth's accretion, of core formation, or of the material from which the earth formed. this dating is based on evidence from radiometric age-dating of meteorite material and is consistent with the radiometric ages of the oldest-known terrestrial and lunar samples.

yes, because even though a theory has a  lot of evidence to support it, it is not always true

segmented body, an exoskeleton made from chitin, and joint appendages.