You are reading a blog written by a student who is working at an archeological dig in cyprus. she mentions that they just uncovered an ancient burial site in which the skeletal remains of a human are found next to those of a cat. the arrangement of the bones suggests that the cat was buried with its owner and may have been a pet. remarkably, the location of the grave relative to other known artifacts suggests it is 10,000 years old. if this is correct, then this is the earliest evidence for cat domestication. the blog author suggests that dendrochronological analysis of some of the wood fragments found nearby, together with c14 analysis should confirm the dates. you are not so sure these two methods will work equally well. which method is most likely to shed accurate insight into the age of these two skeletons? why?

The terrestrial planets are characterized by having a a.) silicate core b.) iron-rich silicate core c.) iron-rich metallic core d.) none of these

To answer this question, researchers studied populations of the dusky salamander (desmognathus ochrophaeus) living on different mountain ranges in the southern appalachian mountains. the researchers tested the reproductive isolation of pairs of salamander populations by leaving one male and one female together and later checking the females for the presence of sperm. four mating combinations were tested for each pair of populations (a and b)—two within the same population (female a with male a and female b with male b) and two between populations (female a with male b and female b with male a). the proportion of successful matings for each mating combination was measured. for example, when all the matings of a particular combination were successful, the researchers gave it a value of 1; when none of the matings were successful, they gave it a value of 0. then the researchers calculated an index of reproductive isolation that ranged from 0 (no isolation) to 2 (full isolation). the reproductive isolation value for two populations is the sum of the proportion of successful matings of each type within populations (aa + bb) minus the sum of the proportion of successful matings of each type between populations (ab + ba). the table provides data for the geographic distances and reproductive isolation values for 27 pairs of dusky salamander populations.

At the age of 6 months, caleb was diagnosed with tay-sachs disease. as his primary care physician, what would you tell his parents about this disease?