A necropsy (postmortem analysis) of a marine sea star that died after it was mistakenly placed in fresh water would likely show that it died because _____
A) it was stressed and needed more time to acclimate to the new conditions
B) it was so hypertonic to the fresh water that it could not osmoregulate
C) its contractile vacuoles ruptured
D) its cells dehydrated and lost the ability to metabolize
B
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Top-down factors that can control the population sizes of plants or animals include
A. seed-dispersing birds. B. parasites and predators. C. widespread phoresy. D. resource partitioning. E. Batesian mimicry.
Which process will break apart a large substance into smaller molecules?
a. Metabolism b. Hydrolysis c. Development d. Condensation e. Reproduction
Passive immunization
a. causes antibody formation. b. is the administration of already formed antibodies from another source. c. is used to prevent a person from becoming infected. d. has a long lasting helpful effect. e. is the same thing as immunotherapy.
A governmental group reviewed the benefits of building a hydroelectric dam on a river in Alaska and determined that the dam would pay for itself within 20 years by producing electricity. However, a conservation group lobbied against the project because of the potential damage it would cause to the environment. Each group issued the following public statements on the project. Which of the statements reflect an environmental benefit of this project?
A) The government will collect higher taxes on sales made to the employees working on building the dam. B) Land loss due to flooding behind the dam will wipe out a large section of forest and riverbank habitat. C) Businesses will spend more money in electrical costs the first two years due to changes in equipment. D) A species known to be endangered will increase significantly in numbers due to changes in the environment.