23 Evan is testing whether the environmental conditions effect the speed that a certain species of protist will reproduce. He shared his procedures and outcomes with a fellow scientist. What is he practicing? A. Repetition, Evan is having another person repeat his process to verify his findings. B. Repetition, Evan is repeating his experiment to verify his process. C. Replication, Evan is having another person repeat his process to verify his findings. D. Replication, Evan is repeating his experiment to verify his process.​

The phlogiston theory in the 17th century attempted to explain burning. the theory stated that combustable objects contained a material called phlogiston, a substance without mass, color, odor, etc. after objects burned, the objects were dephlogistonated and were then in their true form. the phlogiston theory was accepted until the 18th century, when lavoisier proved that combustion requires a gas that has mass. phlogiston is considered a) to be scientific knowledge b) not to be scientific knowledge c) to be proven by scientific method d) to be accepted in the modern scientific community

Now it's your turn to investigate human impact around the world. grab your virtual lab coat and put on your environmental science hat. you will be taking a trip around the globe to explore three locations. at each location, you will investigate the cause and effect relationships of deforestation, desertification, and urbanization. you will also gather evidence of how these factors have impacted the environment over time

In which situations is the principle of cross-cutting relationship useful in determining relative age?