12. If energy must be added to a chemical reaction for the reaction to take place, the reaction is
A. exergonic
C. endergonic
B. exothermic
D. endothermic

Whose work is most likely to be part-time and at several locations? а. physical therapistb. sports physicianc nutritionistd group fitness instructor

Gram-negative bacteria have a cell wall that is! and does not accept the stain, making itappear

Which of the following is likely not involved in this example of ecological succession? a) the rotting remains of plants add to the fertility of the soil. b)the soil becomes so fertile that eel grass is replaced by other plant species. c) the roots from plants stabilize the sediment, keeping it in place. d) the concentration of salt becomes so high that all plant life is destroyed.