The lengths of a sample of tiger canines were measured. 68% of the lengths fell within a range between 15 mm and 45 mm. the mean was 30 mm. what is the standard deviation of this sample?
a. 5 mm
b. 15 mm
c. 7.5 mm
d. 30 mm

How does natural selection change thephenotypes within a population over time?

What is the function of the somatic nervous system? connects the brain and the spinal cord to the rest of the body carry signals to the muscles and glands includes all nerves controlling the muscular system and external sensory receptors controls internal organs like the heart and bladder

Speed is the ratio of the distance of an object moves to