The New Encyclopædia BritannicaEncyclopædia Britannica, 1992 |
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Page 162
... insects is kept constant , the percentage of sterile insects will increase , and fewer young will be produced in each succes- sive generation . Laboratory - reared insects are sterilized by feeding them treated foods or by placing them ...
... insects is kept constant , the percentage of sterile insects will increase , and fewer young will be produced in each succes- sive generation . Laboratory - reared insects are sterilized by feeding them treated foods or by placing them ...
Page 423
... insects ( almost unchanged for more than 320 million years ) and are among Female cockroach ( Periplaneta ) Colin Butler - Bruce Coleman Ltd. the oldest fossil insects . The cockroach is characterized by a flattened , oval body ; long ...
... insects ( almost unchanged for more than 320 million years ) and are among Female cockroach ( Periplaneta ) Colin Butler - Bruce Coleman Ltd. the oldest fossil insects . The cockroach is characterized by a flattened , oval body ; long ...
Page 446
... insect order Coleoptera , which contains the beetles and the weevils and is the largest of the insect orders . The 250,000 known coleopteran species in- clude some of the smallest and largest of the insects : the smallest coleopterans ...
... insect order Coleoptera , which contains the beetles and the weevils and is the largest of the insect orders . The 250,000 known coleopteran species in- clude some of the smallest and largest of the insects : the smallest coleopterans ...
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