Plants contain and may subsequently release into the environment molecules that provide them with defenses against disease, nematodes, herbivores, and other plants.
By the year 2000 the worldwide market for biotechnology-derived food and agricultural products could be valued at tens to hundreds of billions of dollars.
Since the turn of this century, the United States has been dubbed by some "the throw-away society," and it generates approximately 50 percent of the world's solid and industrial waste.
NOT ALL SEEDS survive the struggle for existence. Any marked change in environment, moisture, temperature, amount of sunlight, or soil composition may create conditions...
The stamen produces pollen grains that later form the male cells, or sperms. The stamen has a stalk, or filament, at the tip of which is the pollen sac, or anther.
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