Which best describes the parasympathetic nervous system? a. the spinal cord and the brain
b. rest and digest
c. fight or flight
d. the sensory and motor neutrons

How many trophic levels are there in the following food chain? phytoplankton - shrimp - perch - pike - osprey

Why is it important that fibrin is insoluble in water?

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.