If a radioactive isotope has a half-life of 20 million year, and there is 25% remaining in the igneous rock. How old is the rock?

Dr. bob hypothesizes that drug x causes cuts to heal more quickly. he performs a medical experiment on a group of 100 people and confirms his original hypothesis. in the control group, a 1 cm cut took seven days to heal. in the experimental group, a 1 cm cut took four days to heal. what should dr. bob do next? a) repeat the experiment for accuracy. b) begin selling drug x to the public. c) write a scientific theory about drug x. d) publish the results of the experiment in a scientific journal.

What is responsible for the uneven heating between the poles and the equator on any given day

The combining form leuk/o means red true or false