The hottest layer, has very stable air
Plant cells are eukaryotic while bacteria cells are prokaryotic. One characteristic difference between eukaryotes and prokaryotes is that eukaryotes have membrane-bound organelles, such as a nuclei, Golgi apparati, endoplasmic reticula, mitochondria, and so forth. Thus, choice c would be correct here (endoplasmic reticula can be rough or smooth depending on their specific functions).
A group of genes that operate together are known as chromosomes.
Answer:
My answer to the question is "birds migrating south".