<u>Answer:</u>
Geologists have sorted earth’s history into different geologic time scale. They just clubbed it into time scales by observing the major changes in the life forms that existed on the earth. Inferring to the fossils found in rocks the time scale was calculated.
First era single cell animals were formed then formed the complex animals.Then Mesozoic era where it is known as the era of dinosaurs. Then the evolution of different species of life during Cenozoic era. These major changes found through fossils helped them to form the GTS.
Answer:
Natural Selection is a process where the weaker species usually dies first.
I would go with letter A.
If there was no competition there would be an overpopulation. If there was limited food its risky and they could possibly be extinct.
Mark Brainliest pleaseee
Explanation:
the causes of most of them are unknown. Some birth defects are considered to be physical, while others are thought of as functional. Physical birth defects result in the malformation.
