Why do some organisms have vestigial organs? What will be an ideal response?
Vestigial organs are the remains of structures that were once functional in an ancestor, but offer
no or reduced function now. Over time, natural selection has favored the reduction in size of
these structures which serve little or no useful purpose.
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Why might the following nuclear reaction not be very good for energy production in a fission reactor? U ? Ba + Kr + 1 neutron
A) The material only produces one neutron so the chain reaction will not be very efficient. B) The products are too large. C) There are too many products produced. D) The mass of the byproducts is too high and therefore the energy released will not be high enough. E) Interatomic attraction between the products will impede the efficient separation of the atoms from the unstable nuclei.
Comment on the accuracy and usefulness of the atmospheric calcium additions calculation that was conducted according to Gile and Grossman's dust trap experiment
A) The data and hypothesis were extremely accurate and useful. B) It was perhaps not very accurate, but nonetheless a useful hypothesis. C) It was not an accurate calculation, and therefore not that useful. D) The calculations were very accurate, but not useful because the hypothesis was not clear.
The effect of the river in lengthening the agricultural zones in the diagram on the right is due to
A) the availability of water for irrigation. B) elevation changes. C) fishing. D) defense of the city. E) the ease of transport by water to the market.
Long-term average weather conditions help to determine the _______________ of an area
Fill in the blank(s) with correct word