Survival of the fittest  is a phrase that originated from an evolutionary theory as a way of describing the mechanism of natural selection. The biological concept of fitness is defined as reproductive success.
The normal respiratory rate is 30 to 60 breaths per minute from birth to one year, 24 to 50 breaths per minute from one to three years and 22 to 34 breaths from three to six years old. As the child moves into school-age, the normal respiratory rate slows. From age six to twelve, the normal rate is 18 to 30 breaths per minute, while 12 to 16 breaths is the normal rate from age 12 to 18.
The average adult heart beat average is 70-75 beats per minute. Children have a higher rate in the 80's and 90's, depending on their age.The younger they are the faster the heart rate. Females, generally, have a slightly higher heart rate than males.Heart rate also depends on your age and what you're doing.he heart rate of a hedgehog (or any animal) is dependent on a number of environmental factors. But on average, studies have shown that a hedgehog's resting heart rate is in t â¦ he range of 190 to 280 beats per minute and ~147 beats per minute when sleeping.