Calcium is an important mineral in the body and one that is tightly regulated in the blood with the of several hormones. calcium status plays an important role in the health of bones and a variety of other metabolic functions. therefore, it is essential to understand where to find calcium in food and what factors affect bioavailability and absorption. match the words in the left column to the appropriate blanks in the sentences on the right. note that some terms will remain unused. view available hint(s) reset osteoblasts 1. over 99% of the body's is in the bones and teeth. bone density hypercalcemia calcium 2. when blood calcium is low, the parathyroid glands stimulate the production of refers to the compactness and strength of bones bioavailability 4 break down bone when calcium levels are low osteoclasts 5. the of calcium can depend on a person's age and calcium needs. parathyroid hormone (pth) 6. too much calcium in the blood, or can lead to impaired kidneys and calciumm oxalates deposits in the body 7. certain foods like spinach are high in which can interfere with absorption of certain minerals.

1. variations in a population of moths allow for some of its members to be able to adapt to environmental changes. the better adapted of the moths will be able to survive the change and thus prevail as the “fittest” of the species. (a) describe three mechanisms in which variation can occur within a species population. (b) explain which mechanism or mechanisms would be responsible for the survival of a population of peppered moths better than white moths in an environment affected by industrial soot. justify your answer.

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.

You want to cultivate some exotic plants at your farm. however, the climate is chillier than the temperature range favorable to the crop. which is the best method to use for the cultivation of this exotic crop? a. use a crop rotation method b. use a lot of fertilizer c. prepare the seed bed properly d. use a greenhouse e. use irrigation