Context: Recent molecular phylogenetic studies suggest that most placental orders diverged about 100 to 85 million years ago and that modern families appeared in the period from the late Eocene through the Miocene. But paleontologists object that no placental fossils have been found from before the end of the Cretaceous. The earliest undisputed fossils of placentals come from the early Paleocene, after the extinction of the dinosaurs. In particular, scientists have recently identified an early Paleocene animal named Protungulatum donnae as one of the first placental mammals. The earliest known ancestor of primates is Archicebus achilles from around 55 million years ago. This tiny primate weighed 20–30 grams (0.7–1.1 ounce) and could fit within a human palm.

Question: How long ago did most placental orders diverge from?
Answer: 100 to 85 million years ago

Question: Which two major time periods did placentals appear?
Answer: Eocene through the Miocene

Question: Which time period did early highly undisputed fossils of placental mammals appear?
Answer: Paleocene

Question: When is the earliest know primate thought to had exist?
Answer: 55 million years ago

Question: How much did the first primate weigh?
Answer: 20–30 grams (0.7–1.1 ounce)

Question: Where do the earliest fossils of the Miocene come from?
Answer: Unanswerable

Question: What have scientists identified Eocene as?
Answer: Unanswerable

Question: What is the earliest ancestor of humans from about 55 million years ago?
Answer: Unanswerable

Question: How much did the Protungulatum donnae weigh?
Answer: Unanswerable

Question: What do scientists object about primates before the end of the Paleocene?
Answer: Unanswerable