Which process is defined as breaking down rocks into smaller pieces without changing the rocks' compositions ? Oerosion Ooxidation Ochemical weathering Omechanical weathering

When is your respiration rate likely to change? a. when your intestines are digesting b. when your cells have too much glucose c. when your cells need more oxygen d. when your liver is working after a meal

Is there any species that went extinct in recent years due to natural causes (not caused by human interaction). if so, what caused it?

Is there any solid scientific evidence that humans have been cloned?