Biology, 02.08.2019 19:30 LUCASEDIE7430
Which of the following is a contributing reason behind emerging disease? a. the absence of migration or travel in organisms b. the lack of evolution in hosts c. the lack of evolution in pathogens d. the overuse of antibiotics
Answers: 2
Biology, 22.06.2019 03:00
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.
Answers: 1
Biology, 22.06.2019 11:30
Graded assignment lab report answer the questions below. which combinations of substances resulted in a chemical change? for each metal that participated in a chemical change, write the type of metal it is, based on your examination of the periodic table. were there any metallic compounds that did not react with either the acid or the base? write the type of metal, based on your examination of the periodic table. make a general statement about the reactivity of the metals in this experiment.
Answers: 1
Biology, 22.06.2019 12:00
Aprocedure done under controlled conditions to test a hypothesis is an inquiry.
Answers: 1
Biology, 22.06.2019 18:30
Which of the following are not matched correctly? cd8+: directly destroy infected or cancerous cells t reg cell: reduce the adaptive response once threat passes t l: activate cellular branch (cytotoxic t cells, macrophages, nk cells) t 2: stimulate b cells to make antibodies t (cd4+): mhc i
Answers: 3
Which of the following is a contributing reason behind emerging disease? a. the absence of migratio...
Mathematics, 02.07.2021 20:00
Mathematics, 02.07.2021 20:00
Mathematics, 02.07.2021 20:00
Mathematics, 02.07.2021 20:00
Mathematics, 02.07.2021 20:00
Mathematics, 02.07.2021 20:00
History, 02.07.2021 20:00
History, 02.07.2021 20:00
Mathematics, 02.07.2021 20:00
Mathematics, 02.07.2021 20:00
Mathematics, 02.07.2021 20:00
English, 02.07.2021 20:00
Mathematics, 02.07.2021 20:10