Acidity.
If it has less acid it is considered an alkaline
If it has more acid it is acidic
What are the options for A, B, C, D, E, F, G or are we supposed to guess
Endothermic animals are able to generate their own warmth, however ectothermic animals can not.
On a hot summers day, endothermic animals will not need to rely on the sun's heat as they can regulate their body temperature on their own.
Ectothermic animals will most likely respond to this environmental change by sitting out in the sun to absorb the sun's warmth - as they dependant on this heat.