Sex cells are formed during mitosis.
Answer:
We can see similarities in the autonomy of the organisms. The fossil record also creates a timeline to show which organisms came first. They can then categorize the fossils and look for evolutionary relationships.
Half-life = time in which half of material is lost
1/4 = 1/2 x 1/2 so 2 half lives have gone by if only 1/4 of it is left.
age of rock = 2 x half life = 2x1.3 = 2.6 billion years.
