To know your BMI level, note down your your height in inches and weight in pounds. Now using the BMI formula, you can calculate if you are overweight, obese, underweight or normal. BMI Categories: Despite certain limitations, the BMI is a great way to check the proper height and weight of an individual.
Dolphins survive by living within groups to protect one another, by eating various food found throughout the ocean and by breathing when they surface. Their bodies also help to support them after millions of years of evolution to the slender, torpedo shape that can swim quickly and powerfully.
Sponges (poriferans) are very simple animals that live permanently attached to a location in the water - they are sessile as adults. There are from 5,000 to 10,000 known species of sponges. Most sponges live in salt water - only about 150 species live in fresh water. Sponges evolved over 500 million years ago. The body of this primitive animal has thousands of pores which let water flow through it continually.