A student sets up an experiment to measure the rate of oxygen production of an aquatic plant when it is photosynthesising. The student repeated the experiment several times to calculate the average amount of gas collected. Which two factors should be keep constant during the student's experiment?* (1 Point) 1. The size of the funnel and beaker
2.The size of the aquatic plant and the amount of gas in the measuring cylinder 3.The size of the aquatic plant and the time exposed to light
4.The size of the aquatic plant and the amount of water in the beaker

pls explain

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

Polar zones are cold and tend to be dry because of a pressure system of cold. low high

How do high-energy electrons from glycolysis and the krebs cycle contribute to the formation of atp from adp in the electron transport chain? a. high-energy electrons interact with pyruvic acid to create a phosphate bond with adp, forming atp. b. high-energy electrons supply the needed energy to synthesize atp from the lower-energy adp in the electron transport chain. c. high-energy electrons supply a negative charge which causes the citric acid to oxidize, forming a phosphate group to bond with adp. d. high-energy electrons increase the temperature of adp so it easily reacts to form atp.