Answer:
DNA sequences.
Explanation:
DNA sequences, I believe, are the best evidence of common ancestry since they share more traits with more closely related organisms. The similarities and variances in fossils, anatomy, and embryos are all due to DNA.
Natural selection is what caused them to change
Anaerobic respiration was very weak because the earth had no harmful chemicals in the air at the time
Because its about grow up if question asked germ cells it was supposed to be meiosis but this ques about zygote to become embryo so grow up and this is have to be mitosis.
