Perhaps the bird’s calls could be less attracting and disorienting to predators and the ones with the said distinctive calls could have survived to repopulate and pass down the genes.
Answer:
The answer is most likely B, however it could be C. Here is why:
Explanation:
permanent magnets can usually withstand being dropped a couple of times. However, if you drop it enough and with enough force, it is possible to make it loose magnetism. If you do not have this kind of patience, it is more effective (an much more fun) to hit it really hard with a hammer.
When something is magnetized, all of the atoms are facing a different direction. When you drop it/throw it/hit it with enough force, it causes the atoms to spin, so they are not all facing the same way.
Explanation:
1 chemical reaction endothermic
2 physical change. exothermic
3 chemical reaction endothermic
The balanced reaction would be:
2 C4H10 + 13 O2 ----> 8 CO2 + 10 H2O
Like this both side of the reaction would have:
8 atoms of C
20 atoms of H
26 atoms of O
