Answer:
Researchers initially built up the geologic time scale by considering rock layers and record fossils around the world. With this data, researchers put in Earth's stone layers in request by relative age. Afterward, radioactive dating decided the supreme age of the divisions in the geologic time scale.
The answer is D. Predation of insects resembling twigs of trees occurred.
Answer:
Surface Area, High tempatures and humidity.
Explanation:
Answer: I think it's A: the DNA of all organisms contains the same four bases.
