What is brachycardia?
a. abnormally rapid heartbeat
b. a blood vessel conveying blood to the arm
c. pain referred to the arm during a heart attack
d. abnormally slow heartbeat

Consider the model of the oxygen cycle on earth. the majority of earth's oxygen reservoirs are found in the a) atmosphere. b) biosphere. c) hydrosphere. d) lithosphere.

What amino acid is coded for by this sequence after the mutation

7. describe two strategies that parents can use to cope with stress. 8. describe the three types of childcare available to families. 9. what can parents do to be more involved in their children's education at home and at school? 10. which factors should a parent consider when choosing a childcare option?