Explain how meteor showers and comets are related. Explain how we know meteor showers occur each year
What will be an ideal response?
The meteoroids in a meteor shower are understood to be dust and debris released from the icy nucleus of a comet. When Earth passes through this stream of material, you see a meteor shower. In some cases the comet has wasted away and is no longer visible, but in other cases the comet is still prominent, although located somewhere else along its orbit.
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List the four basic characteristics of chordates. .
What will be an ideal response?
Transduction is
A. the transfer of viral genes to a bacteria by a virus. B. the transfer of bacterial genes to another bacteria by a virus. C. the use of bacterial replication machinery to produce viral particles. D. the transfer of bacterial genes from one bacteria to another. E. the transfer of bacterial genes to another via a pilus.
Geographic biodiversity "hot spots"
A. have the highest vascular plant species richness and ?3 unique ecosystems. B. have the greatest number of species that have lost >50% of their original range. C. contain ?10% of the world's vascular plant species and have lost >50% of their original range. D. have ?1500 endemic plant species and have lost ?70% of the original habitat.
The adrenal hormone, aldosterone, regulates kidney function by
A. increasing the permeability of the collecting duct to salt. B. increasing the permeability of the collecting duct to urea. C. stimulating active reabsorption of sodium, decreasing its excretion. D. triggering a sensation of thirst. E. reducing the blood flow to the kidney.