B.https://www.mansfieldct.org/Schools/MMS/staff/hand/genNaturalselection06.htm this is where I got my source.
Answer:
Frogs have smooth or slimy skin that is moist, whereas toads have thicker, bumpy skin that is usually dry. All toads are poisonous, while frogs are not.
D) a change in protein synthesis
The two types would be thermal energy and light radiation, which is usually present in most ecosystems since the sun gives off both of them.