2 or more different atoms are combined in definite proportions in any compound.
The shuffling of chromosomes that occurs during both fertilization and meiosis can lead to genetic variation. This is because of the independent assortment and crossing over. Hope this answers the question. Have a nice day. Feel free to ask more questions.
C) I and III only just got this question on usa test prep and therefore i'm right
Helps build two main Characteristics out of two choices to classify and unidentified organism