Two species of buttercup are found in a field in North Dakota, and they tend to flower at approximately the same time in early spring
When some ecology students decided to conduct an experiment in community dynamics, they selectively removed one species from the field by hand-picking all emergent plants. The remaining species showed a significant increase in its population size during the next season. This study demonstrated
A) niche realignment.
B) habitat fragmentation.
C) interspecific competition.
D) niche fragmentation.
E) intraspecific competition.
C
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Neurons share three features with almost every other type of cell, there are
a. outer membrane, axons and nucleus. b. nucleus, mitochondria and dendrites. c. cell body, nucleus and axons. d. outer membrane, cell body and mitochondria.
Bioremediation ________ by introducing pollutant-consuming microorganisms or specific nutrients that help microorganisms degrade pollutants
A) accelerates the natural cleanup process B) exploits genetic exchange mechanisms C) invokes microbial evolution D) uses chemotaxis of biodegrading microorganisms
Which of the following is NOT a likely reason why diseases caused by opportunists are becoming more frequent in the U.S. population?
A. HIV individuals (with impaired immune systems) survive longer due to more effective therapies-but this allows them a longer period of time to be infected by opportunists. B. Individuals in the United States are living longer than ever before-but they're living with a number of chronic health issues that can impair the immune system. This leads to a greater likelihood of opportunistic infections. C. Cancer treatments have improved significantly in the last 30 years-but they often suppress the immune system. This leads to a greater likelihood of opportunistic infections in such individuals. D. Travel into and out of the United States has increased significantly. This has the potential to bring in many new pathogens that can cause new infections, even in otherwise healthy and immunocompetent individuals.
In mollusks, which of the following encloses the gills and anus?
a. mantle b. nacre c. cuticle d. clitellum