succession occurs in areas where there is already soil, but the plants and animal life there has been wiped out.

a. Secondary

b. Primary

c. Annual

d. All of these

Transmission electron microscope are best for viewing a) microorganisms in pond water b) internal organs of a mouse c)internal structures of a cell d) surface features of a specimen

Agenetically engineered corn plant is approved for agricultural use. the plant produces pollen that can make its own toxins. these toxins protect the corn plant against pests and no longer require the application of chemical pesticide. what is a likely impact on the farmer of growing such a variety of corn? a- the financial costs for the farmer would be lowered since less crops would be lost to pests. b-the financial costs for the farmer would be lowered since more crops would be lost to pests. c-the farmer may be held responsible for increasing chemical pollution. d-the farmer's expenses for pest control would increase due to an increase in bee population.

Ascientist conducted an investigation about the effects of diet on disease resistance in rats and made surprising observations. the mice with a genetic ear mutation seemed to show similar patterns of resistance compared to mice with normal ears. based on this information, what will most likely occur? a. she will perform a second investigation on the role of certain genes in disease resistance. b. she will revise her hypothesis to pertain to mutations rather than diet, and update her data accordingly. c. she will use this information to determine that her original question was nonscientific, so she will revise it. d. she will determine that her hypothesis was invalid because resistance must be genetic.