C preserved bone because none of the others were enough
I think the diameter of it is 0.03
6. a, 7. c, 8. b , 9. e , 10. d , 11. e, 12.c
Why temperature affects heart rate in ectothermic organisms? If the temperature is within the optimal range for enzyme activity more ATP will be produced and the heart will beat faster due to increased metabolic activity and energy availability.
