After the skin is cut and a capillary wall breaks, what's the first step in working to form a clot?
a. platelets clump at the site.
b. thrombin causes sticky fibrin filaments to form the clot.
c. a set of reactions are triggered.
d. the clot seals the area to prevent further blood loss.

Which statement is true about the cell theory? a) it is well-supported by evidence. b) it is unchangeable and permanent.

What is the main difference between the central nervous system (cns) and the peripheral nervous system (pns)? .the cns involves the brain and spinal cord, and the pns involves the body nerves. the cns involves the body nerves, and the pns involves the brain and spinal cord. the cns involves sensory neurons, and the pns involves motor neurons. the cns involves motor neurons, and the pns involves sensory neurons.

¿cómo demostraron los experimentos de griffith que un factor hereditario estaba involucrado en la transformación bacteriana?