Population ecology is the study of these and other questions about what factors affect population and how and why a population changes over time. Population ecology has its deepest historic roots, and its richest development, in the study of population growth, regulation, and dynamics, or demography.
While running, the neck of a giraffe moves backward and forward to keep the animal balanced. Giraffes have a top speed of about 56 kilometres per hour (35 miles per hour), however, because its legs are so long a galloping giraffe does not appear to be going very fast.
The twisting poses segment of a Bikram yoga workout moves quickly between postures to build heat and flexibility within the body. The first three of these poses, Cobra, Half Locust and Full Locust, last 10 seconds each, followed by the 20-second Floor Bow into the 40-second Fixed Firm.