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.
Hardening of the arteries results in atherosclerosis and deposition of plaques in the walls of the arteries results in <span>atherosclerosis</span>.
Hope this helps !
Photon
My guess would have to be hydropower, since water isn't an un natural substance
Answer: the Earth's spheres interact with other planets in the universe
Explanation: the Earth has different layers and its atmosphere and then when it is in contact with the outer space it can rotate around other planets
