The answer is B) They are always focused on a main idea.
Paragraphs are not always indented; it depends on the writing format. They vary in length from short to long. They do not always have a topic sentence; some writers organize their thoughts and paragraphs well without topic sentences.
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There are three main differences between nuclear and mitochondria DNA (mtDNA): 1.) mtDNA is circular, whereas nuclear DNA is linear. (Both are double stranded) 2.) mtDNA is (generally) uni-parentally inherited, in most animals (not mussels though for example), mtDNA is passed from mother to offspring. from wiki
Answer:
There isn't a real answer.
Explanation:
