<span>Cho finds a dinosaur tooth while on a school field trip. She has found an original-remains fossil . </span>Original remains can be
changed, as minerals in nearby sediments
are stored into the porous areas of an
animal’s hard parts (teeth in this instance) after the soft parts have
decayed. This happens with dinosaur bones and teeth. <span>
</span>
Evolution: Organisms that change throughout time
Natural Selection: Describes how and why the change occurs
Answer: Humans, of course, are also placental mammals
Explanation: Placental mammals include such diverse forms. They are also some of the most familiar organisms to us, including pets such as dogs and cats, as well as many farm and work animals, such as sheep, cattle, and horses. Sense they are most familiar to us human beings are also placental mammals.
