als become larger, their metabolic rates er unit of tissue decrease, and they generally live longer.
432.Asteroids are small and therefore very difficult to identify, even when they are quite close to Earth.
433.A number of modern sculptors have rejected the abstract qualities of minimal and environmental art and developed a style of extreme realism.
434.More than forty tributaries of the Mississippi River system were navigated by steamboats during the period before the outbreak of the Civil War.
435.Mary Eliza McDowell''s introduction to social service came at age sixteen , when she assisted victims of the great Chicago Fire of 1871.
436.Young herons are helpless for a few weeks before they learn to fly.
437.The history of painting is a fascinating chain of events that probably began with the very first pictures ever made.
438.The center of gravity of the human body is located behind the hip joint.
439.The leaves and stems of the alfalfa plant are the only parts of the plant used for livestock feed.
440.Large numbers of people choose to live in or near metropolitan areas simply because they like the rapid pace of city life.
441.What can be dangerous to space travelers is high acceleration or deceleration forces.
442.Organic chemistry has made many new products possible.