The observation that most aquatic vertebrates (e.g., fish, penguins, and whales) have streamlined bodies and fins or flippers for steering are a result of
A. artificial selection.
B. convergent evolution.
C. analogous selection.
D. vestigial selection.
E. sexual evolution.
B. convergent evolution.
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You are exploring a distant planet and find an interesting ecosystem in a lake of liquid methane. Tiny organisms, which you call “quiddles”, are able to use the methane to produce carbon sugars. Other organisms, (widdles), consume the quiddles. You discover that an average widdle weighs three times as much as an average quiddle, and that there are more widdles than quiddles per square meter of the lake. How would you describe the ecological pyramids based on these results?
A. An inverted pyramid of energy, and an inverted pyramid of biomass B. A standard pyramid of numbers, and a standard pyramid of biomass C. An inverted pyramid of numbers, and an inverted pyramid of biomass D. A standard pyramid of numbers, and an inverted pyramid of biomass
In the context of biodiversity, genetic diversity consists of
A. all the alleles and transcription factors within a species B. the amount of genetic variation that occurs within and between populations C. the amount of genetic variation that occurs in an individual D. the amount of genetic variation that occurs between species E. the amount of genetic variation that occurs within and between species
Which organelles are sometimes referred to as rough or smooth, depending on their appearance in electron micrographs?
a. Golgi bodies b. ribosomes c. mitochondria d. lysosomes e. endoplasmic reticulum
What forces filtration at the glomerular capsule?
a) An increase in Glomerular blood pressure b) An increase in osmolarity of tubular fluid c) An decrease in angiotensinogen d) A decrease in Glomerular blood pressure