“We know a great deal more than the Greeks did about the forces of life. But with all our knowledge, no one… — Richard M. Ketchum Copy Share Image
“By the time a tree is full-grown, the underground root system is enormous; a mature oak tree, for example, has literally hundreds… — Richard M. Ketchum Copy Share Image
“The first forests about which anything is known were made up of the simplest kinds of plants, all of them spore-produced -… — Richard M. Ketchum Copy Share Image
“In their urge for survival, the seed-bearing trees hit upon countless different devices for carrying pollen from one flower to another, but… — Richard M. Ketchum Copy Share Image
“A year earlier, representatives of thirteen states had assembled in Philadelphia and declared their intention to form a more perfect union, but what had… — Richard M. Ketchum Copy Share Image
“The most important surviving relics of the primitive plants are mosses and ferns, which give us a clue to how ancient plants solved the… — Richard M. Ketchum Copy Share Image
“We know a great deal more than the Greeks did about the forces of life. But with all our knowledge, no one fully comprehends… — Richard M. Ketchum Copy Share Image
“By the time a tree is full-grown, the underground root system is enormous; a mature oak tree, for example, has literally hundreds of miles… — Richard M. Ketchum Copy Share Image
“The purpose was to insure that their regular pollinators - animals that would best serve the plant, not chance visitors that raided its pollen… — Richard M. Ketchum Copy Share Image
“The first forests about which anything is known were made up of the simplest kinds of plants, all of them spore-produced - horsetails, club… — Richard M. Ketchum Copy Share Image
“Our people are not calculated to be confined in garrisons or kept in any particular service; they soon grow troublesome and uneasy by reflecting… — Richard M. Ketchum Copy Share Image
“Photosynthesis, the activity that ultimately makes all life possible, permits plants to trap energy from the sun and store it in the form of… — Richard M. Ketchum Copy Share Image
“To understand how the first tree appeared on Earth, we must look back more than 3 billion years to Earth’s cooling off and changing… — Richard M. Ketchum Copy Share Image
“In their urge for survival, the seed-bearing trees hit upon countless different devices for carrying pollen from one flower to another, but essentially the… — Richard M. Ketchum Copy Share Image
“A plant has been defined as a living thing that absorbs in microscopic amounts over its surface all that it needs for growth. Through” — Richard M. Ketchum Copy Share Image
“food chain - the vitally important system by which matter from soil and air passes through plants and animals and back to soil and… — Richard M. Ketchum Copy Share Image
