Which statement accurately states what happens when a muscle contracts?

a) calcium combines with atp to produce sarcomeres
b) myosin head attach to and pull on a series of actin-binding sites
c) actin produces myosin and atp
d) calcium produces contractions

Mrna decodes information from the original dna master plan to build proteins in the during the process of ribosomes.

2. which of the following statements does not accurately describe stem cells? a. embryonic stem cells make up the inner cell mass of a blastocyst. b. with more research, stem cells may be used to repair or replace damaged cells. c. the use of stem cells is without any objections since it can be used in therapies to humans. d. adult stem cells are multipotent and can differentiate into many types of cells.

In the image layer a is the topmost layer layer c contains fossils from the precambrian era larrabee contains dinosaur fossils and layer a contains fossils of mammals which two statements are supported by this evidence