Though the Earth is 4.6 billion years old, the oldest seafloor is no more than 280 million years old
Indicate whether the statement is true or false
TRUE
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Earth's population is aging
Indicate whether the statement is true or false.
Which of the following is a concern people have about genetically modified organisms?
A) It can result in livestock that produce less manure. B) It can allow farmers to kill weeds without harming the crop. C) It can lead to reduced use of pesticides. D) It can lead to herbicide resistance. E) It can increase the nutritional value of food.
In some areas, cattle on an open range may compact fragile soils while grazing. This can damage plant roots, leading to fewer, smaller plants, which may in turn cause cattle to graze more and work harder to obtain food
This is an example of a ________. A) food web B) dynamic equilibrium C) negative feedback loop D) homeostatic system E) positive feedback loop
Which of the following best matches the description?Series of stages in the flow of nitrogen in ecosystems.
A. intraspecific competition B. carbon cycle C. limiting factor D. ectoparasite E. nitrogen-fixing bacteria F. habitat G. trophic level H. secondary consumer I. biomass J. omnivore K. community L. interspecific competition M. producer N. denitrifying bacteria O. herbivore P. nitrogen cycle