Can anyone plzzz help me ! Which of these responses is a result of a seasonal change, which happens
over and over at a certain time of year?

O A. Plankton dying due to an oil spill
O B. Fish moving away from polluted water
C. Frogs digging into mud to hibernate
D. Grass becoming sparse due to overgrazing

c

Explanation:

because frogs hibernate at a same time every year

not sure if this is what you'r looking for nnew= nold

before, trains worked using the steam engine. thus, it uses heat so it is crucial to apply heat balance. the steam engine absorbs energy during the stage of boiling water. so, this is the endothermic reaction. when the steam is used to work the piston, it has to release this energy through running the train. the excess energy is released as an exhaust to the chimney. this is the exothermic process because it releases energy to the surroundings.