explain how a leaf is organic matter

Which is the correct symbol for an isotope of iodine with 53 protons and 78 neutrons?

Which best describes the first law of thermodynamics as compared to the second law of thermodynamics? a. the first law describes how thermal energy is conserved but not the direction it moves. b. the first law describes the direction thermal energy moves but not how it is conserved. c. the first law describes how thermal energy can be created but not how it can be destroyed. d. the first law describes how thermal energy can be destroyed but not how it can be created.

Using the free-body diagram, calculate the net force acting on the sled. is the sled in a state of dynamic equilibrium?