Which of the following is the basis for one concern regarding the broad planting of BT-toxic crops? A. pollinating species will come to prefer BT-modified crops, and will leave non-GMO crops unfertilized
B. species of beneficial pollinators will develop a natural immunity to the BT toxins
C. BT-modified crops may kill pollinators, reducing crop fertility in seed and fruit crops
D. exposure to BT may turn insects into super insects, resulting in things like BT-toxic bee stings

Why is excretion necessary to maintain homeostasis?

Select the correct answer. which mutation is harmful to the organism? a. a mutation allowing moths to camouflage better on blackened tree bark b. a mutation making staphylococcus aureus resistant to the antibiotic methicillin c. a mutation inhibiting human immunodeficiency virus from attaching to and entering the cell d. a mutation causing uncontrolled cell division e. a mutation giving plant leaves a bitter taste to discourage herbivores from eating them

Based on the observation that only male crickets produce a song, you hypothesize that a male's song is a form of communication to potential mates. you set up a simple experiment to test this hypothesis. in the laboratory, you place a male snowy tree cricket in enclosure a, which is adjacent to enclosureb. in enclosure b, you place other insects, one at a time, and observe their responses to the male's song. the enclosures are designed so that the two insects being tested cannot see or smell each other, but sound is transmitted from enclosure a to enclosureb.