Students are investigating bone composition in their anatomy lab. They have been supplied with chicken bones and are soaking the bones in vinegar (acid), bleach (base), and water for 48 hours. It is hypothesized
that
changing the pH of the solution will cause a change in the composition of the bone. They mass the bones at 0,
24, and 48 hours and record observations in their data table. After 48 hours, this is the data they have collected.
Why did the students soak one of the bones in water?
A)
this is the control group
B)
this is the dependent variable
this is the independent variable
D)
to test the effects of different solutions

Mrna decodes information from the original dna master plan to build proteins in the during the process of ribosomes.

Awoman whose sister tested positive for a specific mutation in the brca1 gene, which increases the risk for breast and ovarian cancer, is found not to have that mutation but does have a mutation of unknown significance near the known mutation site. how should this woman be counseled? select one: a. she should be informed that her risk for breast cancer is greater than the general population but not as great as her sister’s risk. b. she should be informed that because she does not have the mutation, her risk for breast cancer is not greater than that of the general population. c. she should be informed of her gene mutation status and be presented with all the available prophylaxis options and reconstruction options. d. she should be informed that she does not have the specific mutation but that because another mutation is present she should be vigilant about screening

Why does bubbling occur when vinegar mixed with baking soda