Which of the following provides some evidence that RNA probably evolved before DNA?

Which example below is a current hypothesis regarding the Cambrian explosion?

Which of the following is a characteristic of cnidarians?

Below you’ll find an essay on the processes of mitosis and meiosis, it is in three parts. Please identify the correct paragraph for each part that, when combined, best completes the essay. This question is similar to a multiple choice-type question in that, for each part, one paragraph is correct and two are incorrect. However, this is a “multiple answer” question so you will choose the three paragraphs that will correctly complete the essay. 

Humans, apes, and monkeys are classified together as _____.

Which of the following is characteristic of protostomes?

A _____ is a chordate but not a vertebrate.

Mutations that result in single amino acid substitutions in an enzyme

A transcription unit that is 8,000 nucleotides long may use only 1,200 nucleotides to make a protein consisting of approximately 400 amino acids. This is best explained by the fact that

Which of the following provides some evidence that RNA probably evolved before DNA?