Biology

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Biology

Biology 1 (151.22 KiB) Viewed 145 times

How have the warmer temperatures associated with global warming been beneficial to bark beetles in the Western United States? There is more water available from melting snow They can have two reproductive cycles each year There is more healthy trees on which to feed Their range can be expanded further south
Which of the following organisms would be considered a "primary consumer" in a terrestrial food chain? Grasshopper Mouse Sunflower Owl
As part of the chemical cycling in ecosystems, organic molecules are converted to inorganic molecules that replenish abiotic reservoirs. This conversion is achieved by Producers Primary consumers Secondary and tertiary consumers Decomposers
Chemicals called PCBs have in the past found their way into Puget Sound and surrounding waters. Understanding that PCBs show biological magnification within a food chain which of the following organisms in this food chain would contain the greatest concentration of chemical? Plankton Chinook salmon Orca killer whale Crustaceans Small fish
Which of the following are homologous structures? Wings of a butterfly... wings of a hawk Forelimb of a dog... forelimb of a whale Forelimb of a cow... hind limb of a horse Beak of a bird... biting mouthparts of a mosquito
Populations of bacteria were exposed to a particular antibiotic for several months. The antibiotic imposed selection pressure on one particular population of bacteria. Over time, this population of bacteria developed resistance to the antibiotic. This scenario describes as the outcome of natural selection. Disruptive selection Directional selection Stabilizing selection