Answer:
A) Reaction X used a catalyst
Explanation:
Reaction X has a lower activation energy and the most likely cause of this would be a catalyst.
The answer to this would be A
I think this because animals play a huge role in water Cycle and carbon cycle.
Answer:
Feathers perform a number of functions for a bird:
1) They provide insulation, body temperature of most birds is maintained at around 40 C.
2) Feathers allow for flight.
3) Feathers control what a bird looks like by supplying the bird with colors.
Explanation:
Feathers insulate birds from water and cold temperatures. They may also be plucked to line the nest and provide insulation to the eggs and young. The individual feathers in the wings and tail play important roles in controlling flight. Some species have a crest of feathers on their heads.
