Suppose that chemical composition is uniform among stars formed from the same cloud of gas and dust, but that chemical composition varies among stars formed from different clouds of gas and dust. Student 2 would most likely agree with which of the following statements comparing the chemical compositions of the stars in the present-day Algol system at the time they formed?

单项选择题Based on Table 1, a cosmic ray flux of 440,000 particles m2 hr would correspond to a cover of low clouds that is closest to which of the following?

单项选择题In Figure 2, at which of the following wavelengths does the rate of photosynthesis exceed the rate of photosynthesis at 670 nm ?

单项选择题Based on Figure 3, for a given seismograph, the time elapsed between the arrival of the first p-waves and the arrival of the first s-waves from an earthquake focus 10,500 km away would most likely be:

单项选择题Which of the following variables was kept constant in Study 2 ?

单项选择题According to Figure 2, which of the following statements best describes the relative amplitudes of the first p-waves to arrive at the seismograph and the first s-waves to arrive at the seismograph? The amplitude of the first p-waves to arrive at the seismograph is:

单项选择题Based on Fact 5 and Student 1’s discussion, which of the 3 stars in the Algol system, if any, was most likely the first to become an MS star?

单项选择题Study 1 differed from Study 2 in which of the following ways?

单项选择题Patrons at a certain restaurant can select two of three appetizers—fruit, soup, and salad—along with two of three vegetables—carrots, squash, and peas.What is the probability that any patron will select fruit, salad, squash, and peas?

单项选择题According to Figure 3, at Sites 1, 2, and 3, the smallest δ18O value of the groundwater in the lake clay was recorded at a depth between:

单项选择题Which of the following integers is the closest to the value for the unit length of one leg of a triangle with hypotenuse 13,if the other leg is 7 units long?