• fossils.: Remains or imprints of once-living organisms
• Amber fossils. : remains trapped and hardened tree sap.
• Sedimentary fossils: remains trapped in layers of sediment (small rock and
mineral pieces).
• cast fossils Minerals replace the body's material
• what happens if an animal doesn't become a fossil?
It decomposes
• do all parts of an animal become fossilized?
no
• embryology. the study of embryos of different species and how they may appear
similar in early stages of development.
• Common ancestor the most recent ancestor two different species share.
• …………………… comparing the DNA and molecules of two species to see if they
share a common ancestor.
• scientist have examined fossils of extinct species that feature in between whales
and land mammals and these species are called transitional characters
• what are examples of unused structures in modern whales?
Tiny leg bones
• HW page37