Answer:
I think a because fossils do stay for a very long time ribbit
liver contain abundance of smooth endoplasmic reticulum
Answer:
Approximately 90% of all living plants are group of Angiosperm
I believe it's stem cells.
Embryologist study embryos because Embryology is central to evolutionary developmental biology ("evo-devo"), which studies the genetic control of the development process (e.g. morphogens), its link to cell signalling, its roles in certain diseases and mutations, and its links to stem cell research.
