Which of the following is a benefit of introducing a variety of plants into a farm field, or of reviving older “heirloom” varieties of food plants such as potatoes and tomatoes? Select two correct answers. A. better crop yields
B. protection of genetic diversity
C. reduction of the chance of pests destroying a crop
D. reduction of the amount of land devoted to agriculture

The observations of hooke and van leeuwenhoek documenting the existence of microscopic cells formed the basis of what important theory? a. the cell theory stating that all living things are composed of cellsb. the theory of spontaneous generation, which held that life forms could arise spontaneouslyc. the theory of chemotherapy, or use of antimicrobials to destroy pathogenic organismsd. the germ theory of disease and causative agents

Do fish feel pain? and if they do what pain

In figure 1-2 what is the distance from point b to point c?