Answer:
gas in the atmosphere ......
Organic would be living material, so no....
Pathogens would be bacteria and fungi, so no...
thermal would be heat, so no...
must be macroscopic
Answer:
what do you need help with?
Answer: cardiac muscle
Why by Mimiwhatsup: Cardiac Muscles or your heart cells need more energy than the normal cells of kidney, skin, etc.
It was previously believed that zebras were white animals with black stripes, since some zebras have white underbellies. Embryological evidence, however, shows that the animal's background color is black and the white stripes and bellies are additions.